citus v12.1.5 (July 17, 2024)

Adds support for MERGE commands with single shard distributed target tables (#7643)
Fixes an error with MERGE commands when insert value does not have source distribution column (#7627)

citus v12.1.4 (May 28, 2024)

Adds null check for node in HasRangeTableRef (#7604)

citus v12.1.3 (April 18, 2024)

Allows overwriting host name for all inter-node connections by supporting "host" parameter in citus.node_conninfo (#7541)
Changes the order in which the locks are acquired for the target and reference tables, when a modify request is initiated from a worker node that is not the "FirstWorkerNode" (#7542)
Fixes a performance issue when distributing a table that depends on an extension (#7574)
Fixes a performance issue when using "\d tablename" on a server with many tables (#7577)
Fixes a crash caused by some form of ALTER TABLE ADD COLUMN statements. When adding multiple columns, if one of the ADD COLUMN statements contains a FOREIGN constraint omitting the referenced columns in the statement, a SEGFAULT was occurring. (#7522)
Fixes a performance issue when creating distributed tables if many already exist (#7575, #7579)
Fixes a bug when hostname in pg_dist_node resolves to multiple IPs (#7377)
Fixes performance issue when tracking foreign key constraints on systems with many constraints (#7578)
Fixes segmentation fault when using CASE WHEN in DO block within functions. (#7554)
Fixes undefined behavior in master_disable_node due to argument mismatch (#7492)
Fixes some potential bugs by correctly marking some variables as volatile (#7570)
Logs username in the failed connection message (#7432)

citus v11.0.10 (February 15, 2024)

Removes pg_send_cancellation and all references (#7135)

citus v12.1.2 (February 12, 2024)

Fixes the incorrect column count after ALTER TABLE (#7379)

citus v12.0.1 (July 11, 2023)

Fixes incorrect default value assumption for VACUUM(PROCESS_TOAST) #7122)
Fixes a bug that causes an unexpected error when adding a column with a NULL constraint (#7093)
Fixes a bug that could cause COPY logic to skip data in case of OOM (#7152)
Fixes a bug with deleting colocation groups (#6929)
Fixes memory and memory contexts leaks in Foreign Constraint Graphs (#7236)
Fixes shard size bug with too many shards (#7018)
Fixes the incorrect column count after ALTER TABLE (#7379)
Improves citus_tables view performance (#7050)
Makes sure to disallow creating a replicated distributed table concurrently (#7219)
Removes pg_send_cancellation and all references (#7135)

citus v11.3.1 (February 12, 2024)

Disallows MERGE when the query prunes down to zero shards (#6946)
Fixes a bug related to non-existent objects in DDL commands (#6984)
Fixes a bug that could cause COPY logic to skip data in case of OOM (#7152)
Fixes a bug with deleting colocation groups (#6929)
Fixes incorrect results on fetching scrollable with hold cursors (#7014)
Fixes memory and memory context leaks in Foreign Constraint Graphs (#7236)
Fixes replicate reference tables task fail when user is superuser (#6930)
Fixes the incorrect column count after ALTER TABLE (#7379)
Improves citus_shard_sizes performance (#7050)
Makes sure to disallow creating a replicated distributed table concurrently (#7219)
Removes pg_send_cancellation and all references (#7135)

citus v11.2.2 (February 12, 2024)

Fixes a bug in background shard rebalancer where the replicate reference tables task fails if the current user is not a superuser (#6930)
Fixes a bug related to non-existent objects in DDL commands (#6984)
Fixes a bug that could cause COPY logic to skip data in case of OOM (#7152)
Fixes a bug with deleting colocation groups (#6929)
Fixes incorrect results on fetching scrollable with hold cursors (#7014)
Fixes memory and memory context leaks in Foreign Constraint Graphs (#7236)
Fixes the incorrect column count after ALTER TABLE (#7379)
Improves failure handling of distributed execution (#7090)
Makes sure to disallow creating a replicated distributed table concurrently (#7219)
Removes pg_send_cancellation (#7135)

citus v11.1.7 (February 12, 2024)

Fixes memory and memory context leaks in Foreign Constraint Graphs (#7236)
Fixes a bug related to non-existent objects in DDL commands (#6984)
Fixes a bug that could cause COPY logic to skip data in case of OOM (#7152)
Fixes a bug with deleting colocation groups (#6929)
Fixes incorrect results on fetching scrollable with hold cursors (#7014)
Fixes the incorrect column count after ALTER TABLE (#7379)
Improves failure handling of distributed execution (#7090)
Makes sure to disallow creating a replicated distributed table concurrently (#7219)
Removes pg_send_cancellation and all references (#7135)

citus v11.0.9 (February 12, 2024)

Fixes a bug that could cause COPY logic to skip data in case of OOM (#7152)
Fixes a bug with deleting colocation groups (#6929)
Fixes memory and memory context leaks in Foreign Constraint Graphs (#7236)
Fixes the incorrect column count after ALTER TABLE (#7462)
Improve failure handling of distributed execution (#7090)

citus v12.1.1 (November 9, 2023)

Fixes leaking of memory and memory contexts in Citus foreign key cache (#7236)
Makes sure to disallow creating a replicated distributed table concurrently (#7219)

citus v12.1.0 (September 12, 2023)

Adds support for PostgreSQL 16.0 (#7173)
Add citus_schema_move() function which moves tables within a distributed schema to another node (#7180)
Adds citus_pause_node_within_txn() UDF that allows pausing the node with given id (#7089)
Makes sure to enforce shard level colocation with the GUC citus.enable_non_colocated_router_query_pushdown (#7076)
Allows creating reference / distributed-schema tables from local tables added to metadata and that use identity columns (#7131)
Propagates BUFFER_USAGE_LIMIT option in VACUUM and ANALYZE (#7114)
Propagates PROCESS_MAIN, SKIP_DATABASE_STATS, ONLY_DATABASE_STATS options in VACUUM (#7114)
Propagates GENERIC_PLAN option in EXPLAIN (#7141)
Propagates "rules" option in CREATE COLLATION (#7185)
Propagates GRANT/ REVOKE for database privileges (#7109)
Adds TRUNCATE trigger support on Citus foreign tables (#7170)
Removes pg_send_cancellation (#7135)
Prevents unnecessarily pulling the data into coordinator for some INSERT .. SELECT queries that target a single-shard group (#7077)
Makes sure that rebalancer throws an error if replication factor is greater than the shard allowed node count. Also makes sure to avoid moving a shard to a node that it already exists on. (#7074)
Fixes a bug that may appear during 2PC recovery when there are multiple databases (#7174)
Fixes a bug that could cause COPY logic to skip data in case of out-of-memory (#7152)
Fixes a bug that causes an unexpected error when adding a column with a NULL constraint (#7093)
Fixes PROCESS_TOAST default value to true (#7122)
Improves the error thrown when there is datatype mismatch in MERGE ON (#7081)

citus v12.0.0 (July 11, 2023)

Adds support for schema-based sharding. While citus.enable_schema_based_sharding GUC allows sharding the database based on newly created schemas, citus_schema_distribute() allows doing so for the existing schemas. Distributed schemas used for sharding the database can be listed by using the view citus_schemas, monitored by using the view citus_stat_schemas, and undistributed by using the udf citus_schema_undistribute() (#6866, #6979, #6933, #6936 and many others)
Supports MERGE command across non-colocated distributed tables/subqueries, reference tables and joins on non-distribution columns (#6927)
Drops PG13 Support (#7002, #7007)
Changes default rebalance strategy to by_disk_size (#7033)
Changes by_disk_size rebalance strategy to have a base size (#7035)
Improves citus_tables view performance (#7018)
Improves tenant monitoring performance (#6868)
Introduces the GUC citus.stat_tenants_untracked_sample_rate for sampling in tenant monitoring (#7026)
Adds CPU usage to citus_stat_tenants (#6844)
Propagates ALTER SCHEMA .. OWNER TO .. commands to worker (#6987)
Allows ADD COLUMN in command string with other commands (#7032)
Allows DROP CONSTRAINT in command string with other commands (#7012)
Makes sure to properly handle index storage options for ADD CONSTRAINT / COLUMN commands (#7032)
Makes sure to properly handle IF NOT EXISTS for ADD COLUMN commands (#7032)
Allows using generated identity column based on int/smallint when creating a distributed table with the limitation of not being able perform DMLs on identity columns from worker nodes (#7008)
Supports custom cast from / to timestamptz in time partition management UDFs (#6923)
Optimizes pushdown planner on memory and cpu (#6945)
Changes citus_shard_sizes view's table_name column to shard_id (#7003)
The GUC search_path is now reported when it is updated (#6983)
Disables citus.enable_non_colocated_router_query_pushdown GUC by default to ensure generating a consistent distributed plan for the queries that reference non-colocated distributed tables (#6909)
Disallows MERGE with filters that prune down to zero shards (#6946)
Makes sure to take shouldhaveshards setting into account for a node when planning rebalance steps (#6887)
Improves the compatibility with other extension by forwarding to existing emit_log_hook in our log hook (#6877)
Fixes wrong result when using NOT MATCHED with MERGE command (#6943)
Fixes querying the view citus_shard_sizes when there are too many shards (#7018)
Fixes a bug related to type casts from other types to text/varchar (#6391)
Fixes propagating CREATE SCHEMA AUTHORIZATION .. with no schema name (#7015)
Fixes an error when creating a FOREIGN KEY without a name referencing a schema qualified table (#6986)
Fixes a rare bug which mostly happens with queries that contain both outer join and where clauses (#6857)
Fixes a bug related to propagation of schemas when pg_dist_node is empty (#6900)
Fixes a crash when a query is locally executed with explain analyze (#6892)

citus v11.3.0 (May 2, 2023)

Introduces CDC implementation for Citus using logical replication (#6623, #6810, #6827)
Adds support for MERGE command on co-located distributed tables joined on distribution column (#6696, #6733)
Adds the view citus_stat_tenants that monitor statistics on tenant usages (#6725)
Adds the GUC citus.max_background_task_executors_per_node to control number of background task executors involving a node (#6771)
Allows parallel shard moves in background rebalancer (#6756)
Introduces the GUC citus.metadata_sync_mode that introduces nontransactional mode for metadata sync (#6728, #6889)
Propagates CREATE/ALTER/DROP PUBLICATION statements for distributed tables (#6776)
Adds the GUC citus.enable_non_colocated_router_query_pushdown to ensure generating a consistent distributed plan for the queries that reference non-colocated distributed tables when set to "false" (#6793)
Checks if all moves are able to be done via logical replication for rebalancer (#6754)
Correctly reports shard size in citus_shards view (#6748)
Fixes a bug in shard copy operations (#6721)
Fixes a bug that prevents enforcing identity column restrictions on worker nodes (#6738)
Fixes a bug with INSERT .. SELECT queries with identity columns (#6802)
Fixes an issue that caused some queries with custom aggregates to fail (#6805)
Fixes an issue when citus_set_coordinator_host is called more than once (#6837)
Fixes an uninitialized memory access in shard split API (#6845)
Fixes memory leak and max allocation block errors during metadata syncing (#6728)
Fixes memory leak in undistribute_table (#6693)
Fixes memory leak in alter_distributed_table (#6726)
Fixes memory leak in create_distributed_table (#6722)
Fixes memory leak issue with query results that returns single row (#6724)
Improves rebalancer when shard groups have placement count less than worker count (#6739)
Makes sure to stop maintenance daemon when dropping a database even without Citus extension (#6688)
Prevents using alter_distributed_table and undistribute_table UDFs when a table has identity columns (#6738)
Prevents using identity columns on data types other than bigint on distributed tables (#6738)

citus v11.2.1 (April 20, 2023)

Correctly reports shard size in citus_shards view (#6748)
Fixes a bug in shard copy operations (#6721)
Fixes a bug with INSERT .. SELECT queries with identity columns (#6802)
Fixes an uninitialized memory access in shard split API (#6845)
Fixes compilation for PG13.10 and PG14.7 (#6711)
Fixes memory leak in alter_distributed_table (#6726)
Fixes memory leak issue with query results that returns single row (#6724)
Prevents using alter_distributed_table and undistribute_table UDFs when a table has identity columns (#6738)
Prevents using identity columns on data types other than bigint on distributed tables (#6738)

citus v11.1.6 (April 20, 2023)

Correctly reports shard size in citus_shards view (#6748)
Fixes a bug in shard copy operations (#6721)
Fixes a bug that breaks pg upgrades if the user has a columnar table (#6624)
Fixes a bug that causes background rebalancer to fail when a reference table doesn't have a primary key (#6682)
Fixes a regression in allowed foreign keys on distributed tables (#6550)
Fixes a use-after-free bug in connection management (#6685)
Fixes an unexpected foreign table error by disallowing to drop the table_name option (#6669)
Fixes an uninitialized memory access in shard split API (#6845)
Fixes compilation for PG13.10 and PG14.7 (#6711)
Fixes crash that happens when trying to replicate a reference table that is actually dropped (#6595)
Fixes memory leak issue with query results that returns single row (#6724)
Fixes the modifiers for subscription and role creation (#6603)
Makes sure to quote all identifiers used for logical replication to prevent potential issues (#6604)
Makes sure to skip foreign key validations at the end of shard moves (#6640)

citus v11.0.8 (April 20, 2023)

Correctly reports shard size in citus_shards view (#6748)
Fixes a bug that breaks pg upgrades if the user has a columnar table (#6624)
Fixes an unexpected foreign table error by disallowing to drop the table_name option (#6669)
Fixes compilation warning on PG13 + OpenSSL 3.0 (#6038, #6502)
Fixes crash that happens when trying to replicate a reference table that is actually dropped (#6595)
Fixes memory leak issue with query results that returns single row (#6724)
Fixes the modifiers for subscription and role creation (#6603)
Fixes two potential dangling pointer issues (#6504, #6507)
Makes sure to quote all identifiers used for logical replication to prevent potential issues (#6604)

citus v10.2.9 (April 20, 2023)

Correctly reports shard size in citus_shards view (#6748)
Fixes a bug in ALTER EXTENSION citus UPDATE (#6383)
Fixes a bug that breaks pg upgrades if the user has a columnar table (#6624)
Fixes a bug that prevents retaining columnar table options after a table-rewrite (#6337)
Fixes memory leak issue with query results that returns single row (#6724)
Raises memory limits in columnar from 256MB to 1GB for reads and writes (#6419)

citus v10.1.6 (April 20, 2023)

Fixes a crash that occurs when the aggregate that cannot be pushed-down returns empty result from a worker (#5679)
Fixes columnar freezing/wraparound bug (#5962)
Fixes memory leak issue with query results that returns single row (#6724)
Prevents alter table functions from dropping extensions (#5974)

citus v10.0.8 (April 20, 2023)

Fixes a bug that could break DROP SCHEMA/EXTENSON commands when there is a columnar table (#5458)
Fixes a crash that occurs when the aggregate that cannot be pushed-down returns empty result from a worker (#5679)
Fixes columnar freezing/wraparound bug (#5962)
Fixes memory leak issue with query results that returns single row (#6724)
Prevents alter table functions from dropping extensions (#5974)

citus v9.5.12 (April 20, 2023)

Fixes a crash that occurs when the aggregate that cannot be pushed-down returns empty result from a worker (#5679)
Fixes memory leak issue with query results that returns single row (#6724)
Prevents alter table functions from dropping extensions (#5974)

citus v11.2.0 (January 30, 2023)

Adds support for outer joins with reference tables / complex subquery-CTEs in the outer side of the join (e.g., <reference table> LEFT JOIN <distributed table>)
Adds support for creating PRIMARY KEYs and UNIQUE/EXCLUSION/CHECK/ FOREIGN KEY constraints via ALTER TABLE command without providing a constraint name
Adds support for using identity columns on Citus tables
Adds support for MERGE command on local tables
Adds citus_job_list(), citus_job_status() and citus_rebalance_status() UDFs that allow monitoring rebalancer progress
Adds citus_task_wait() UDF to wait on desired task status
Adds source_lsn, target_lsn and status fields into get_rebalance_progress()
Introduces citus_copy_shard_placement() UDF with node id
Introduces citus_move_shard_placement() UDF with node id
Propagates BEGIN properties to worker nodes
Propagates DROP OWNED BY to worker nodes
Deprecates citus.replicate_reference_tables_on_activate and makes it always off
Drops GUC citus.defer_drop_after_shard_move
Drops GUC citus.defer_drop_after_shard_split
Drops SHARD_STATE_TO_DELETE state and uses the cleanup records instead
Allows citus_update_node() to work with nodes from different clusters
Adds signal handlers for queue monitor to gracefully shutdown, cancel and to see config changes
Defers cleanup after a failure in shard move or split
Extends cleanup process for replication artifacts
Improves a query that terminates compelling backends from citus_update_node()
Includes Citus global pid in all internal application_names
Avoids leaking search_path to workers when executing DDL commands
Fixes alter_table_set_access_method error() for views
Fixes citus_drain_node() to allow draining the specified worker only
Fixes a bug in global pid assignment for connections opened by rebalancer internally
Fixes a bug that causes background rebalancer to fail when a reference table doesn't have a primary key
Fixes a bug that might cause failing to query the views based on tables that have renamed columns
Fixes a bug that might cause incorrectly planning the sublinks in query tree
Fixes a floating point exception during create_distributed_table_concurrently()
Fixes a rebalancer failure due to integer overflow in subscription and role creation
Fixes a regression in allowed foreign keys on distributed tables
Fixes a use-after-free bug in connection management
Fixes an unexpected foreign table error by disallowing to drop the table_name option
Fixes an uninitialized memory access in create_distributed_function()
Fixes crash that happens when trying to replicate a reference table that is actually dropped
Make sure to cleanup the shard on the target node in case of a failed/aborted shard move
Makes sure to create replication artifacts with unique names
Makes sure to disallow triggers that depend on extensions
Makes sure to quote all identifiers used for logical replication to prevent potential issues
Makes sure to skip foreign key validations at the end of shard moves
Prevents crashes on UPDATE with certain RETURNING clauses
Propagates column aliases in the shard-level commands

citus v11.1.5 (December 12, 2022)

Fixes two potential dangling pointer issues
Fixes compilation warning on PG13 + OpenSSL 3.0

citus v11.0.7 (November 8, 2022)

Adds the GUC citus.allow_unsafe_constraints to allow unique/exclusion/ primary key constraints without distribution column
Allows citus_internal application_name with additional suffix
Disallows having ON DELETE/UPDATE SET DEFAULT actions on columns that default to sequences
Fixes a bug in ALTER EXTENSION citus UPDATE
Fixes a bug that causes a crash with empty/null password
Fixes a bug that causes not retaining trigger enable/disable settings when re-creating them on shards
Fixes a bug that might cause inserting incorrect DEFAULT values when applying foreign key actions
Fixes a bug that prevents retaining columnar table options after a table-rewrite
Fixes a bug that prevents setting colocation group of a partitioned distributed table to none
Fixes an issue that can cause logical reference table replication to fail
Raises memory limits in columnar from 256MB to 1GB for reads and writes

citus v11.1.4 (October 24, 2022)

Fixes an upgrade problem for worker_fetch_foreign_file when upgrade path starts from 8.3 up to 11.1
Fixes an upgrade problem for worker_repartition_cleanup when upgrade path starts from 9.1 up to 11.1

citus v11.1.3 (October 14, 2022)

Adds support for PostgreSQL 15.0
Fixes a bug in ALTER EXTENSION citus UPDATE
Fixes a bug that causes a crash with empty/null password
Fixes a bug that causes not retaining trigger enable/disable settings when re-creating them on shards
Fixes a bug that prevents retaining columnar table options after a table-rewrite
Raises memory limits in columnar from 256MB to 1GB for reads and writes

citus v11.1.2 (September 30, 2022)

Adds support for PostgreSQL 15rc1
Disallows having ON DELETE/UPDATE SET DEFAULT actions on columns that default to sequences
Fixes a bug that might cause inserting incorrect DEFAULT values when applying foreign key actions
Fixes a performance issue related to shard-moves by creating replica identities before copying shards
Improves logging during shard-splits and resource cleanup
Makes sure to reuse connections for shard-splits and logical replication
Makes sure to try dropping replication slots a few more times after a failure at the end of the shard-split

citus v11.1.1 (September 16, 2022)

Fixes a bug that prevents create_distributed_table_concurrently() working on an empty node

citus v11.1.0 (September 15, 2022)

Adds support for PostgreSQL 15beta4
Adds ability to run shard rebalancer in the background
Adds create_distributed_table_concurrently() UDF to distribute tables without interrupting the application
Adds citus_split_shard_by_split_points() UDF that allows splitting a shard to specified set of nodes without blocking writes and based on given split points
Adds support for non-blocking tenant isolation
Adds support for isolation tenants that use partitioned tables or columnar tables
Separates columnar table access method into a separate logical extension
Adds support for online replication in replicate_reference_tables()
Improves performance of blocking shard moves
Improves non-blocking shard moves with a faster custom copy logic
Creates all foreign keys quickly at the end of a shard move
Limits get_rebalance_progress() to show shards in moving state
Makes citus_move_shard_placement() idempotent if shard already exists on target node
Shows citus_copy_shard_placement() progress in get_rebalance_progres()
Supports changing CPU priorities for backends and shard moves
Adds the GUC citus.allow_unsafe_constraints to allow unique/exclusion/ primary key constraints without distribution column
Introduces GUC citus.skip_constraint_validation
Introduces citus_locks view
Improves citus_tables view by showing local tables added to metadata
Improves columnar table access method by moving old catalog tables into an internal schema and introduces more secure & informative views based on them
Adds support for GRANT/REVOKE on aggregates
Adds support for NULLS NOT DISTINCT clauses for indexes for PG15+
Adds support for setting relation options for columnar tables using ALTER TABLE
Adds support for unlogged distributed sequences
Removes do_repair option from citus_copy_shard_placement()
Removes deprecated re-partitioning functions like worker_hash_partition_table()
Drops support for isolation tenants that use replicated tables
Checks existence of the shards before insert, delete, and update
Hides tables owned by extensions from citus_tables and citus_shards
Propagates VACUUM and ANALYZE to worker nodes
Makes non-partitioned table size calculation quicker
Improves create_distributed_table() by creating new colocation entries when using colocate_with => 'none'
Ensures that SELECT .. FOR UPDATE opens a transaction block when used in a function call
Prevents a segfault by disallowing usage of SQL functions referencing to a distributed table
Prevents creating a new colocation entry when replicating reference tables
Fixes a bug in query escaping in undistribute_table() and alter_distributed_table()
Fixes a bug preventing the usage of isolate_tenant_to_new_shard() with text column
Fixes a bug that may cause GRANT to propagate within CREATE EXTENSION
Fixes a bug that causes incorrectly marking metadatasynced flag for coordinator
Fixes a bug that may prevent Citus from creating function in transaction block properly
Fixes a bug that prevents promoting read-replicas as primaries
Fixes a bug that prevents setting colocation group of a partitioned distributed table to none
Fixes a bug that prevents using AUTO option for VACUUM (INDEX_CLEANUP) operation
Fixes a segfault in citus_copy_shard_placement()
Fixes an issue that can cause logical reference table replication to fail
Fixes schema name qualification for RENAME SEQUENCE statement
Fixes several small memory leaks
Fixes the transaction timestamp column of the get_current_transaction_id() on coordinator
Maps any unused parameters to a generic type in prepared statements

citus v10.2.8 (August 19, 2022)

Fixes compilation warning caused by latest upgrade script changes
Fixes compilation warning on PG13 + OpenSSL 3.0

citus v11.0.6 (August 19, 2022)

Fixes a bug that could cause failures in CREATE ROLE statement
Fixes a bug that could cause failures in create_distributed_table
Fixes a bug that prevents distributing tables that depend on sequences
Fixes reference table lock contention
Fixes upgrade paths for 11.0

citus v10.2.7 (August 19, 2022)

Fixes a bug that could cause failures in INSERT INTO .. SELECT
Fixes a bug that could cause leaking files when materialized views are refreshed
Fixes an unexpected error for foreign tables when upgrading Postgres
Fixes columnar freezing/wraparound bug
Fixes reference table lock contention
Prevents alter table functions from dropping extensions

citus v11.0.5 (August 1, 2022)

Avoids possible information leakage about existing users
Allows using WITH HOLD cursors with parameters
Fixes a bug that could cause failures in INSERT INTO .. SELECT
Fixes a bug that prevents pushing down IN expressions when using columnar custom scan
Fixes a concurrency bug between creating a co-located distributed table and shard moves
Fixes a crash that can happen due to catalog read in shmem_exit
Fixes an unexpected error caused by constraints when moving shards
Fixes an unexpected error for foreign tables when upgrading Postgres
Prevents adding local table into metadata if there is a view with circular dependencies on it
Reduces memory consumption of index name fix for partitioned tables

citus v11.0.4 (July 13, 2022)

Fixes a bug that prevents promoting read-replicas as primaries

citus v11.0.3 (July 5, 2022)

Fixes a bug that prevents adding local tables with materialized views to Citus metadata
Fixes a bug that prevents using COMPRESSION and CONSTRAINT on a column
Fixes upgrades to Citus 11 when there are no nodes in the metadata

citus v11.0.2 (June 15, 2022)

Drops support for PostgreSQL 12
Open sources enterprise features, see the rest of changelog items
Turns metadata syncing on by default
Introduces citus_finish_citus_upgrade() procedure which is necessary to upgrade from earlier versions
Open sources non-blocking shard moves/shard rebalancer (citus.logical_replication_timeout)
Open sources propagation of CREATE/DROP/ALTER ROLE statements
Open sources propagation of GRANT statements
Open sources propagation of CLUSTER statements
Open sources propagation of ALTER DATABASE ... OWNER TO ...
Open sources optimization for COPY when loading JSON to avoid double parsing of the JSON object (citus.skip_jsonb_validation_in_copy)
Open sources support for row level security
Open sources support for pg_dist_authinfo, which allows storing different authentication options for different users, e.g. you can store passwords or certificates here.
Open sources support for pg_dist_poolinfo, which allows using connection poolers in between coordinator and workers
Open sources tracking distributed query execution times using citus_stat_statements (citus.stat_statements_max, citus.stat_statements_purge_interval, citus.stat_statements_track). This is disabled by default.
Open sources tenant_isolation
Open sources support for sslkey and sslcert in citus.node_conninfo
Adds citus.max_client_connections GUC to limit non-Citus connections
Allows locally creating objects having a dependency that cannot be distributed
Distributes aggregates with CREATE AGGREGATE command
Distributes functions with CREATE FUNCTION command
Adds citus.create_object_propagation GUC to control DDL creation behaviour in transactions
Hides shards based on application_name prefix
Prevents specifying application_name via citus.node_conninfo
Starts identifying rebalancer backends by application_name=citus_rebalancer
Starts identifying internal backends by application_name=citus_internal
Adds citus.enable_unsafe_triggers flag to enable unsafe triggers on distributed tables
Adds fix_partition_shard_index_names UDF to fix currently broken names
Adds propagation for foreign server commands
Adds propagation of DOMAIN objects
Adds propagation of TEXT SEARCH CONFIGURATION objects
Adds propagation of TEXT SEARCH DICTIONARY objects
Adds support for ALTER FUNCTION ... SUPPORT ... commands
Adds support for CREATE SCHEMA AUTHORIZATION statements without schema name
Adds support for CREATE/DROP/ALTER VIEW commands
Adds support for TRUNCATE for foreign tables
Adds support for adding local tables to metadata using citus_add_local_table_to_metadata() UDF
Adds support for adding partitioned local tables to Citus metadata
Adds support for automatic binary encoding in re-partition joins when possible
Adds support for foreign tables in MX
Adds support for operator class parameters in indexes
Adds support for re-partition joins in transaction blocks
Adds support for re-partition joins on followers
Adds support for shard replication > 1 hash distributed tables on Citus MX
Adds support for LOCK commands on distributed tables from worker nodes
Adds support for TABLESAMPLE
Adds support for propagating views when syncing Citus table metadata
Improves handling of IN, OUT and INOUT parameters for functions
Introduces citus_backend_gpid() UDF to get global pid of the current backend
Introduces citus_check_cluster_node_health UDF to check cluster connectivity
Introduces citus_check_connection_to_node UDF to check node connectivity
Introduces citus_coordinator_nodeid UDF to find the node id of the coordinator node
Introduces citus_stat_activity view and drops citus_worker_stat_activity UDF
Introduces citus.use_citus_managed_tables GUC to add local tables to Citus metadata automatically
Introduces a new flag force_delegation in create_distributed_function()
Introduces run_command_on_coordinator UDF
Introduces synchronous option to citus_disable_node() UDF
Introduces citus_is_coordinator UDF to check whether a node is the coordinator
Allows adding a unique constraint with an index
Allows create_distributed_function() on a function owned by an extension
Allows creating distributed tables in sequential mode
Allows disabling nodes when multiple failures happen
Allows lock_table_if_exits to be called outside of a transaction blocks
Adds support for pushing procedures with OUT arguments down to the worker nodes
Overrides pg_cancel_backend() and pg_terminate_backend() to run with global pid
Delegates function calls of the form SELECT .. FROM func()
Adds propagation of CREATE SCHEMA .. GRANT ON SCHEMA .. commands
Propagates pg_dist_object to worker nodes
Adds propagation of SCHEMA operations
Adds missing version-mismatch checks for columnar tables
Adds missing version-mismatch checks for internal functions
citus_shard_indexes_on_worker shows all local shard indexes regardless of search_path
citus_shards_on_worker shows all local shards regardless of search_path
Enables distributed execution from run_command_on_* functions
Deprecates inactive shard state, never marks any placement inactive
Disables distributed & reference foreign tables
Prevents propagating objects having a circular dependency
Prevents propagating objects having a dependency to an object with unsupported type
Deprecates master_get_table_metadata UDF
Disallows remote execution from queries on shards
Drops citus.enable_cte_inlining GUC
Drops citus.single_shard_commit_protocol GUC, defaults to 2PC
Drops support for citus.multi_shard_commit_protocol, always use 2PC
Avoids unnecessary errors for ALTER STATISTICS IF EXISTS when the statistics does not exist
Fixes a bug that prevents dropping/altering indexes
Fixes a bug that prevents non-client backends from accessing shards
Fixes columnar freezing/wraparound bug
Fixes invalid read of size 1 memory error with citus_add_node
Fixes schema name qualification for ALTER/DROP SEQUENCE
Fixes schema name qualification for ALTER/DROP STATISTICS
Fixes schema name qualification for CREATE STATISTICS
Fixes a bug that causes columnar storage pages to have zero LSN
Fixes a bug that causes issues while create dependencies from multiple sessions
Fixes a bug that causes reading columnar metapage as all-zeros when writing to a columnar table
Fixes a bug that could break DROP SCHEMA/EXTENSON commands when there is a columnar table
Fixes a bug that could break pg upgrades due to missing pg_depend records for columnar table access method
Fixes a bug that could cause CREATE INDEX to fail for expressions when using custom search_path
Fixes a bug that could cause worker_save_query_explain_analyze to fail on custom types
Fixes a bug that could cause failed re-partition joins to leak result tables
Fixes a bug that could cause prerequisite columnar table access method objects being not created during pg upgrades
Fixes a bug that could cause re-partition joins involving local shards to fail
Fixes a bug that could cause false positive distributed deadlocks due to local execution
Fixes a bug that could cause leaking files when materialized views are refreshed
Fixes a bug that could cause unqualified DROP DOMAIN IF EXISTS to fail
Fixes a bug that could cause wrong schema and ownership after alter_distributed_table
Fixes a bug that could cause EXPLAIN ANALYZE to fail for prepared statements with custom type
Fixes a bug that could cause Citus not to create function in transaction block properly
Fixes a bug that could cause returning invalid JSON when running EXPLAIN ANALYZE with subplans
Fixes a bug that limits usage of sequences in non-int columns
Fixes a bug that prevents DROP SCHEMA CASCADE
Fixes a build error that happens when lz4 is not installed
Fixes a clog lookup failure that could occur when writing to a columnar table
Fixes a crash that occurs when the aggregate that cannot be pushed-down returns empty result from a worker
Fixes a missing FROM clause entry error
Fixes a possible segfault that could happen when reporting distributed deadlock
Fixes an issue that could cause unexpected errors when there is an in-progress write to a columnar table
Fixes an unexpected error that occurs due to aborted writes to a columnar table with an index
Fixes an unexpected error that occurs when writing to a columnar table created in older version
Fixes issue when compiling Citus from source with some compilers
Fixes issues on ATTACH PARTITION logic
Fixes naming issues of newly created partitioned indexes
Honors enable_metadata_sync in node operations
Improves nested execution checks and adds GUC to control (citus.allow_nested_distributed_execution)
Improves self-deadlock prevention for CREATE INDEX / REINDEX CONCURRENTLY commands for builds using PG14 or higher
Moves pg_dist_object to pg_catalog schema
Parallelizes metadata syncing on node activation
Partitions shards to be co-located with the parent shards
Prevents Citus table functions from being called on shards
Prevents creating distributed functions when there are out of sync nodes
Prevents alter table functions from dropping extensions
Refrains reading the metadata cache for all tables during upgrade
Provides notice message for idempotent create_distributed_function calls
Reinstates optimisation for uniform shard interval ranges
Relaxes table ownership check to privileges check while acquiring lock
Drops support for citus.shard_placement_policy GUC
Drops master_append_table_to_shard UDF
Drops master_apply_delete_command UDF
Removes copy into new shard logic for append-distributed tables
Drops support for distributed cstore_fdw tables in favor of Citus columnar table access method
Removes support for dropping distributed and local indexes in the same statement
Replaces citus.enable_object_propagation GUC with citus.enable_metadata_sync
Requires superuser for citus_add_node() and citus_activate_node() UDFs
Revokes read access to columnar.chunk from unprivileged user
Disallows unsupported lateral subqueries on distributed tables
Stops updating shard range in citus_update_shard_statistics for append tables

citus v10.2.5 (March 15, 2022)

Fixes a bug that could cause worker_save_query_explain_analyze to fail on custom types
Fixes a bug that limits usage of sequences in non-integer columns
Fixes a crash that occurs when the aggregate that cannot be pushed-down returns empty result from a worker
Improves concurrent metadata syncing and metadata changing DDL operations

citus v10.2.4 (February 1, 2022)

Adds support for operator class parameters in indexes
Fixes a bug with distributed functions that have OUT parameters or return TABLE
Fixes a build error that happens when lz4 is not installed
Improves self-deadlock prevention for CREATE INDEX & REINDEX CONCURRENTLY commands for builds using PG14 or higher
Fixes a bug that causes commands to fail when application_name is set

citus v10.1.4 (February 1, 2022)

Adds missing version checks for columnar tables
Fixes a bug that could break DROP SCHEMA/EXTENSION commands when there is a columnar table
Fixes a build error that happens when lz4 is not installed
Fixes a missing FROM clause entry error
Reinstates optimisation for uniform shard interval ranges
Fixes a bug that causes commands to fail when application_name is set

citus v10.2.3 (November 29, 2021)

Adds fix_partition_shard_index_names udf to fix currently broken partition index names
Fixes a bug that could break DROP SCHEMA/EXTENSION commands when there is a columnar table
Fixes a bug that could break pg upgrades due to missing pg_depend records for columnar table access method
Fixes a missing FROM clause entry error
Fixes an unexpected error that occurs when writing to a columnar table created in older versions
Fixes issue when compiling Citus from source with some compilers
Reinstates optimisation for uniform shard interval ranges
Relaxes table ownership check to privileges check while acquiring lock

citus v10.0.6 (November 12, 2021)

Adds missing version checks for columnar tables
Fixes a bug that caused worker_append_table_to_shard to write as superuser
Fixes a bug with local cached plans on tables with dropped columns
Fixes a missing FROM clause entry error
Fixes a use after free issue that could happen when altering a distributed table
Reinstates optimisation for uniform shard interval ranges

citus v9.5.10 (November 8, 2021)

Fixes a release problem in 9.5.9

citus v9.5.9 (November 8, 2021)

Fixes a bug preventing INSERT SELECT .. ON CONFLICT with a constraint name on local shards
Fixes a bug with local cached plans on tables with dropped columns
Fixes a crash in queries with a modifying CTE and a SELECT without FROM
Fixes a missing FROM clause entry error
Fixes a missing intermediate result when coordinator is in metadata
Reinstates optimisation for uniform shard interval ranges

citus v9.2.8 (November 4, 2021)

Adds a configure flag to enforce security

citus v9.2.7 (November 3, 2021)

Fixes ALTER TABLE IF EXISTS SET SCHEMA with non-existing table bug
Fixes CREATE INDEX CONCURRENTLY with no index name on a postgres table bug
Fixes a bug that could cause crashes with certain compile flags
Fixes a crash because of overflow in partition id with certain compile flags
Fixes a memory leak in subtransaction memory handling
Fixes deparsing for queries with anonymous column references

citus v10.2.2 (October 14, 2021)

Fixes a bug that causes reading columnar metapage as all-zeros when writing to a columnar table
Fixes a bug that could cause prerequisite columnar table access method objects being not created during pg upgrades
Fixes a bug that could cause CREATE INDEX to fail for expressions when using custom search_path
Fixes an unexpected error that occurs due to aborted writes to a columnar table with an index

citus v10.2.1 (September 24, 2021)

Adds missing version-mismatch checks for columnar tables
Adds missing version-mismatch checks for internal functions
Fixes a bug that could cause partition shards being not co-located with parent shards
Fixes a bug that prevents pushing down boolean expressions when using columnar custom scan
Fixes a clog lookup failure that could occur when writing to a columnar table
Fixes an issue that could cause unexpected errors when there is an in-progress write to a columnar table
Revokes read access to columnar.chunk from unprivileged user

citus v10.1.3 (September 17, 2021)

Fixes a bug that caused worker_append_table_to_shard to write as superuser
Fixes a crash in shard rebalancer when no distributed tables exist
Fixes a use after free issue that could happen when altering a distributed table

citus v9.5.8 (September 15, 2021)

Fixes a bug that caused worker_append_table_to_shard to write as superuser
Fixes a use after free issue that could happen when altering a distributed table

citus v10.2.0 (September 14, 2021)

Adds PostgreSQL 14 support
Adds hash & btree index support for columnar tables
Adds helper UDFs for easy time partition management: get_missing_time_partition_ranges, create_time_partitions, and drop_old_time_partitions
Adds propagation of ALTER SEQUENCE
Adds support for ALTER INDEX ATTACH PARTITION
Adds support for CREATE INDEX ON ONLY
Allows more graceful failovers when replication factor > 1
Enables chunk group filtering to work with Params for columnar tables
Enables qual push down for joins including columnar tables
Enables transferring of data using binary encoding by default on PG14
Improves master_update_table_statistics and provides distributed deadlock detection
Includes data_type and cache in sequence definition on worker
Makes start/stop_metadata_sync_to_node() transactional
Makes sure that table exists before updating table statistics
Prevents errors with concurrent citus_update_table_statistics and DROP table
Reduces memory usage of columnar table scans by freeing the memory used for last stripe read
Shows projected columns for columnar tables in EXPLAIN output
Speeds up dropping partitioned tables
Synchronizes hasmetadata flag on mx workers
Uses current user while syncing metadata
Adds a parameter to cleanup metadata when metadata syncing is stopped
Fixes a bug about int and smallint sequences on MX
Fixes a bug that cause partitions to have wrong distribution key after DROP COLUMN
Fixes a bug that caused worker_append_table_to_shard to write as superuser
Fixes a bug that caused worker_create_or_alter_role to crash with NULL input
Fixes a bug that causes pruning incorrect shard of a range distributed table
Fixes a bug that may cause crash while aborting transaction
Fixes a bug that prevents attaching partitions when colocated foreign key exists
Fixes a bug with nextval('seq_name'::text)
Fixes a crash in shard rebalancer when no distributed tables exist
Fixes a segfault caused by use after free in when using a cached connection
Fixes a UNION pushdown issue
Fixes a use after free issue that could happen when altering a distributed table
Fixes showing target shard size in the rebalance progress monitor

citus v10.1.2 (August 16, 2021)

Allows more graceful failovers when replication factor > 1
Fixes a bug that causes partitions to have wrong distribution key after DROP COLUMN

citus v10.0.5 (August 16, 2021)

Allows more graceful failovers when replication factor > 1
Fixes a bug that causes partitions to have wrong distribution key after DROP COLUMN
Improves citus_update_table_statistics and provides distributed deadlock detection

citus v9.5.7 (August 16, 2021)

Allows more graceful failovers when replication factor > 1
Fixes a bug that causes partitions to have wrong distribution key after DROP COLUMN
Improves master_update_table_statistics and provides distributed deadlock detection

citus v9.4.6 (August 8, 2021)

Allows more graceful failovers when replication factor > 1
Improves master_update_table_statistics and provides distributed deadlock detection

citus v10.1.1 (August 5, 2021)

Improves citus_update_table_statistics and provides distributed deadlock detection
Fixes showing target shard size in the rebalance progress monitor

citus v10.1.0 (July 14, 2021)

Drops support for PostgreSQL 11
Adds shard_count parameter to create_distributed_table function
Adds support for ALTER DATABASE OWNER
Adds support for temporary columnar tables
Adds support for using sequences as column default values when syncing metadata
alter_columnar_table_set enforces columnar table option constraints
Continues to remove shards after failure in DropMarkedShards
Deprecates the citus.replication_model GUC
Enables citus.defer_drop_after_shard_move by default
Ensures free disk space before moving a shard
Fetches shard size on the fly for the rebalance monitor
Ignores old placements when disabling or removing a node
Implements improvement_threshold at shard rebalancer moves
Improves orphaned shard cleanup logic
Improves performance of citus_shards
Introduces citus.local_hostname GUC for connections to the current node
Makes sure connection is closed after each shard move
Makes sure that target node in shard moves is eligible for shard move
Optimizes partitioned disk size calculation for shard rebalancer
Prevents connection errors by properly terminating connections
Prevents inheriting a distributed table
Prevents users from dropping & truncating known shards
Pushes down VALUES clause as long as not in outer part of a JOIN
Reduces memory usage for multi-row inserts
Reduces memory usage while rebalancing shards
Removes length limits around partition names
Removes dependencies on the existence of public schema
Executor avoids opening extra connections
Excludes orphaned shards while finding shard placements
Preserves access method of materialized views when undistributing or altering distributed tables
Fixes a bug that allowed moving of shards belonging to a reference table
Fixes a bug that can cause a crash when DEBUG4 logging is enabled
Fixes a bug that causes pruning incorrect shard of a range distributed table
Fixes a bug that causes worker_create_or_alter_role to crash with NULL input
Fixes a bug where foreign key to reference table was disallowed
Fixes a bug with local cached plans on tables with dropped columns
Fixes data race in get_rebalance_progress
Fixes FROM ONLY queries on partitioned tables
Fixes an issue that could cause citus_finish_pg_upgrade to fail
Fixes error message for local table joins
Fixes issues caused by omitting public schema in queries
Fixes nested SELECT query with UNION bug
Fixes null relationName bug at parallel execution
Fixes possible segfaults when using Citus in the middle of an upgrade
Fixes problems with concurrent calls of DropMarkedShards
Fixes shared dependencies that are not resident in a database
Fixes stale hostnames bug in prepared statements after master_update_node
Fixes the relation size bug during rebalancing
Fixes two race conditions in the get_rebalance_progress
Fixes using 2PC when it might be necessary

citus v10.0.4 (July 14, 2021)

Introduces citus.local_hostname GUC for connections to the current node
Removes dependencies on the existence of public schema
Removes limits around long partition names
Fixes a bug that can cause a crash when DEBUG4 logging is enabled
Fixes a bug that causes pruning incorrect shard of a range distributed table
Fixes an issue that could cause citus_finish_pg_upgrade to fail
Fixes FROM ONLY queries on partitioned tables
Fixes issues caused by public schema being omitted in queries
Fixes problems with concurrent calls of DropMarkedShards
Fixes relname null bug when using parallel execution
Fixes two race conditions in the get_rebalance_progress

citus v9.5.6 (July 8, 2021)

Fixes minor bug in citus_prepare_pg_upgrade that caused it to lose its idempotency

citus v9.5.5 (July 7, 2021)

Adds a configure flag to enforce security
Fixes a bug that causes pruning incorrect shard of a range distributed table
Fixes an issue that could cause citus_finish_pg_upgrade to fail

citus v9.4.5 (July 7, 2021)

Adds a configure flag to enforce security
Avoids re-using connections for intermediate results
Fixes a bug that causes pruning incorrect shard of a range distributed table
Fixes a bug that might cause self-deadlocks when COPY used in TX block
Fixes an issue that could cause citus_finish_pg_upgrade to fail

citus v8.3.3 (March 23, 2021)

Fixes a bug that leads to various issues when a connection is lost
Fixes a bug where one could create a foreign key between non-colocated tables
Fixes a deadlock during transaction recovery
Fixes a memory leak in adaptive executor when query returns many columns

citus v10.0.3 (March 16, 2021)

Prevents infinite recursion for queries that involve UNION ALL below JOIN
Fixes a crash in queries with a modifying CTE and a SELECT without FROM
Fixes upgrade and downgrade paths for citus_update_table_statistics
Fixes a bug that causes SELECT queries to use 2PC unnecessarily
Fixes a bug that might cause self-deadlocks with CREATE INDEX / REINDEX CONCURRENTLY commands
Adds citus.max_cached_connection_lifetime GUC to set maximum connection lifetime
Adds citus.remote_copy_flush_threshold GUC that controls per-shard memory usages by COPY
Adds citus_get_active_worker_nodes UDF to deprecate master_get_active_worker_nodes
Skips 2PC for readonly connections in a transaction
Makes sure that local execution starts coordinated transaction
Removes open temporary file warning when cancelling a query with an open tuple store
Relaxes the locks when adding an existing node

citus v10.0.2 (March 3, 2021)

Adds a configure flag to enforce security
Fixes a bug due to cross join without target list
Fixes a bug with UNION ALL on PG 13
Fixes a compatibility issue with pg_audit in utility calls
Fixes insert query with CTEs/sublinks/subqueries etc
Grants SELECT permission on citus_tables view to public
Grants SELECT permission on columnar metadata tables to public
Improves citus_update_table_statistics and provides distributed deadlock detection
Preserves colocation with procedures in alter_distributed_table
Prevents using alter_columnar_table_set and alter_columnar_table_reset on a columnar table not owned by the user
Removes limits around long table names

citus v9.5.4 (February 19, 2021)

Fixes a compatibility issue with pg_audit in utility calls

citus v10.0.1 (February 19, 2021)

Fixes an issue in creation of pg_catalog.time_partitions view

citus v9.5.3 (February 16, 2021)

Avoids re-using connections for intermediate results
Fixes a bug that might cause self-deadlocks when COPY used in xact block
Fixes a crash that occurs when distributing table after dropping foreign key

citus v10.0.0 (February 16, 2021)

Adds support for per-table option for columnar storage
Adds rebalance_table_shards to rebalance the shards across the nodes
Adds citus_drain_node to move all shards away from any node
Enables single-node Citus for production workloads
Adds support for local table and distributed table/subquery joins
Enables foreign keys between reference tables and local tables (citus.enable_local_reference_table_foreign_keys)
Adds support for co-located/recurring correlated subqueries
Adds support for co-located/recurring sublinks in the target list
Adds alter_distributed_table and alter_table_set_access_method UDFs
Adds alter_old_partitions_set_access_method UDF to compress old partitions
Adds cascade option to undistribute_table UDF for foreign key connected relations
Allows distributed table creation immediately after CREATE EXTENSION citus
Automatically adds coordinator to the metadata before the first distributed table created
Introduces adaptive connection management for local nodes
Adds support for local execution in INSERT..SELECT commands that perform re-partitioning
Adds public.citus_tables view
Adds pg_catalog.citus_shards, pg_catalog.citus_shards_on_worker and pg_catalog.citus_shard_indexes_on_worker views
Adds pg_catalog.time_partitions view for simple (time) partitions and their access methods
Adds remove_local_tables_from_metadata UDF for local tables automatically added to metadata when defining foreign keys with reference tables
Adds support for CREATE INDEX commands without index name on citus tables
Adds support for CREATE TABLE ... USING table_access_method statements
Propagates ALTER TABLE .. SET LOGGED/UNLOGGED statements
Propagates ALTER INDEX .. SET STATISTICS statements
Propagates ALTER SCHEMA RENAME statements
Propagates CREATE STATISTICS statements across workers.
Propagates DROP STATISTICS statements across the workers
Propagates all types of ALTER STATISTICS statements.
Avoids establishing new connections until the previous ones are finalized
Avoids re-using connections for intermediate results
Improves performance in some subquery pushdown cases
Removes unused citus.binary_master_copy_format GUC
Removes unused citus.expire_cached_shards GUC
Removes unused citus.large_table_shard_count GUC
Removes unused citus.max_assign_task_batch_size GUC
Removes unused citus.max_running_tasks_per_node GUC
Removes unused citus.max_task_string_size GUC
Removes unused citus.max_tracked_tasks_per_node GUC
Removes unused citus.sslmode GUC
Removes unused citus.task_tracker_delay GUC
Removes the word 'master' from Citus UDFs
Removes unused UDF mark_tables_colocated
Removes upgrade_to_reference_table UDF
Renames 'master' to 'distributed' for columns of citus_dist_stat_activity
Renames 'master' to 'distributed' for columns of citus_worker_stat_activity
Chooses the default co-location group deterministically
Deletes distributed transaction entries when removing a node
Drops support for create_citus_local_table in favor of citus_add_local_table_to_metadata
Fixes EXPLAIN ANALYZE error when query returns no columns
Fixes a bug preventing INSERT SELECT .. ON CONFLICT with a constraint name on local shards
Fixes a bug related to correctness of multiple joins
Fixes a bug that might cause self-deadlocks when COPY used in xact block
Fixes a bug with partitioned tables that block new partition creation due to wrong constraint names on workers
Fixes a crash that occurs when distributing table after dropping foreign key
Fixes a crash when adding/dropping foreign keys from reference to local tables added to metadata
Fixes an unexpected error when executing CREATE TABLE IF NOT EXISTS PARTITION OF commands
Fixes deadlock issue for CREATE INDEX in single node
Fixes distributed deadlock detection being blocked by metadata sync
Fixes handling indexes when adding local table to metadata
Fixes undistribute_table when table has column with GENERATED ALWAYS AS STORED expressions
Improves concurrent index creation failure message
Prevents empty placement creation in the coordinator when executing master_create_empty_shard()

citus v9.5.2 (January 26, 2021)

Fixes distributed deadlock detection being blocked by metadata sync
Prevents segfaults when SAVEPOINT handling cannot recover from connection failures
Fixes possible issues that might occur with single shard distributed tables

citus v9.4.4 (December 28, 2020)

Fixes a bug that could cause router queries with local tables to be pushed down
Fixes a segfault in connection management due to invalid connection hash entries
Fixes possible issues that might occur with single shard distributed tables

citus v9.5.1 (December 1, 2020)

Enables PostgreSQL's parallel queries on EXPLAIN ANALYZE
Fixes a bug that could cause excessive memory consumption when a partition is created
Fixes a bug that triggers subplan executions unnecessarily with cursors
Fixes a segfault in connection management due to invalid connection hash entries

citus v9.4.3 (November 24, 2020)

Enables PostgreSQL's parallel queries on EXPLAIN ANALYZE
Fixes a bug that triggers subplan executions unnecessarily with cursors

citus v9.5.0 (November 10, 2020)

Adds support for PostgreSQL 13
Removes the task-tracker executor
Introduces citus local tables
Introduces undistribute_table UDF to convert tables back to postgres tables
Adds support for EXPLAIN (ANALYZE) EXECUTE and EXPLAIN EXECUTE
Adds support for EXPLAIN (ANALYZE, WAL) for PG13
Sorts the output of EXPLAIN (ANALYZE) by execution duration.
Adds support for CREATE TABLE ... USING table_access_method
Adds support for WITH TIES option in SELECT and INSERT SELECT queries
Avoids taking multi-shard locks on workers
Enforces citus.max_shared_pool_size config in COPY queries
Enables custom aggregates with multiple parameters to be executed on workers
Enforces citus.max_intermediate_result_size in local execution
Improves cost estimation of INSERT SELECT plans
Introduces delegation of procedures that read from reference tables
Prevents pull-push execution for simple pushdownable subqueries
Improves error message when creating a foreign key to a local table
Makes citus_prepare_pg_upgrade idempotent by dropping transition tables
Disallows ON TRUE outer joins with reference & distributed tables when reference table is outer relation to avoid incorrect results
Disallows field indirection in INSERT/UPDATE queries to avoid incorrect results
Disallows volatile functions in UPDATE subqueries to avoid incorrect results
Fixes CREATE INDEX CONCURRENTLY crash with local execution
Fixes citus_finish_pg_upgrade to drop all backup tables
Fixes a bug that cause failures when RECURSIVE VIEW joined reference table
Fixes DROP SEQUENCE failures when metadata syncing is enabled
Fixes a bug that caused CREATE TABLE with CHECK constraint to fail
Fixes a bug that could cause VACUUM to deadlock
Fixes master_update_node failure when no background worker slots are available
Fixes a bug that caused replica identity to not be propagated on shard repair
Fixes a bug that could cause crashes after connection timeouts
Fixes a bug that could cause crashes with certain compile flags
Fixes a bug that could cause deadlocks on CREATE INDEX
Fixes a bug with genetic query optimization in outer joins
Fixes a crash when aggregating empty tables
Fixes a crash with inserting domain constrained composite types
Fixes a crash with multi-row & router INSERT's in local execution
Fixes a possibility of doing temporary file cleanup more than once
Fixes incorrect setting of join related fields
Fixes memory issues around deparsing index commands
Fixes reference table access tracking for sequential execution
Fixes removal of a single node with only reference tables
Fixes sending commands to coordinator when it is added as a worker
Fixes write queries with const expressions and COLLATE in various places
Fixes wrong cancellation message about distributed deadlock

citus v9.4.2 (October 21, 2020)

Fixes a bug that could lead to multiple maintenance daemons
Fixes an issue preventing views in reference table modifications

citus v9.4.1 (September 30, 2020)

Fixes EXPLAIN ANALYZE output truncation
Fixes a deadlock during transaction recovery

citus v9.4.0 (July 28, 2020)

Improves COPY by honoring max_adaptive_executor_pool_size config
Adds support for insert into local table select from distributed table
Adds support to partially push down tdigest aggregates
Adds support for receiving binary encoded results from workers using citus.enable_binary_protocol
Enables joins between local tables and CTEs
Adds showing query text in EXPLAIN output when explain verbose is true
Adds support for showing CTE statistics in EXPLAIN ANALYZE
Adds support for showing amount of data received in EXPLAIN ANALYZE
Introduces downgrade paths in migration scripts
Avoids returning incorrect results when changing roles in a transaction
Fixes ALTER TABLE IF EXISTS SET SCHEMA with non-existing table bug
Fixes CREATE INDEX CONCURRENTLY with no index name on a postgres table bug
Fixes a bug that could cause crashes with certain compile flags
Fixes a bug with lists of configuration values in ALTER ROLE SET statements
Fixes a bug that occurs when coordinator is added as a worker node
Fixes a crash because of overflow in partition id with certain compile flags
Fixes a crash that may happen if no worker nodes are added
Fixes a crash that occurs when inserting implicitly coerced constants
Fixes a crash when aggregating empty tables
Fixes a memory leak in subtransaction memory handling
Fixes crash when using rollback to savepoint after cancellation of DML
Fixes deparsing for queries with anonymous column references
Fixes distribution of composite types failing to include typemods
Fixes explain analyze on adaptive executor repartitions
Fixes possible error throwing in abort handle
Fixes segfault when evaluating func calls with default params on coordinator
Fixes several EXPLAIN ANALYZE issues
Fixes write queries with const expressions and COLLATE in various places
Fixes wrong cancellation message about distributed deadlocks
Reports correct INSERT/SELECT method in EXPLAIN
Disallows triggers on citus tables

citus v9.3.5 (July 24, 2020)

Fixes ALTER TABLE IF EXISTS SET SCHEMA with non-existing table bug
Fixes CREATE INDEX CONCURRENTLY with no index name on a postgres table bug
Fixes a crash because of overflow in partition id with certain compile flags

citus v9.3.4 (July 21, 2020)

Fixes a bug that could cause crashes with certain compile flags
Fixes a bug with lists of configuration values in ALTER ROLE SET statements
Fixes deparsing for queries with anonymous column references

citus v9.3.3 (July 10, 2020)

Fixes a memory leak in subtransaction memory handling

citus v9.3.2 (Jun 22, 2020)

Fixes a version bump issue in 9.3.1

citus v9.2.6 (Jun 22, 2020)

Fixes a version bump issue in 9.2.5

citus v9.3.1 (Jun 17, 2020)

Adds support to partially push down tdigest aggregates
Fixes a crash that occurs when inserting implicitly coerced constants

citus v9.2.5 (Jun 17, 2020)

Adds support to partially push down tdigest aggregates
Fixes an issue with distributing tables having generated cols not at the end

citus v9.3.0 (May 6, 2020)

Adds max_shared_pool_size to control number of connections across sessions
Adds support for window functions on coordinator
Improves shard pruning logic to understand OR-conditions
Prevents using an extra connection for intermediate result multi-casts
Adds propagation of ALTER ROLE .. SET statements
Adds update_distributed_table_colocation UDF to update colocation of tables
Introduces a UDF to truncate local data after distributing a table
Adds support for creating temp schemas in parallel
Adds support for evaluation of nextval in the target list on coordinator
Adds support for local execution of COPY/TRUNCATE/DROP/DDL commands
Adds support for local execution of shard creation
Uses local execution in a transaction block
Adds support for querying distributed table sizes concurrently
Allows master_copy_shard_placement to replicate placements to new nodes
Allows table type to be used in target list
Avoids having multiple maintenance daemons active for a single database
Defers reference table replication to shard creation time
Enables joins between local tables and reference tables in transaction blocks
Ignores pruned target list entries in coordinator plan
Improves SIGTERM handling of maintenance daemon
Increases the default of citus.node_connection_timeout to 30 seconds
Fixes a bug that occurs when creating remote tasks in local execution
Fixes a bug that causes some DML queries containing aggregates to fail
Fixes a bug that could cause failures in queries with subqueries or CTEs
Fixes a bug that may cause some connection failures to throw errors
Fixes a bug which caused queries with SRFs and function evalution to fail
Fixes a bug with generated columns when executing COPY dist_table TO file
Fixes a crash when using non-constant limit clauses
Fixes a failure when composite types used in prepared statements
Fixes a possible segfault when dropping dist. table in a transaction block
Fixes a possible segfault when non-pushdownable aggs are solely used in HAVING
Fixes a segfault when executing queries using GROUPING
Fixes an error when using LEFT JOIN with GROUP BY on primary key
Fixes an issue with distributing tables having generated cols not at the end
Fixes automatic SSL permission issue when using "initdb --allow-group-access"
Fixes errors which could occur when subqueries are parameters to aggregates
Fixes possible issues by invalidating the plan cache in master_update_node
Fixes timing issues which could be caused by changing system clock

citus v9.2.4 (March 30, 2020)

Fixes a release problem in 9.2.3

citus v9.2.3 (March 25, 2020)

Do not use C functions that have been banned by Microsoft
Fixes a bug that causes wrong results with complex outer joins
Fixes issues found using static analysis
Fixes left join shard pruning in pushdown planner
Fixes possibility for segmentation fault in internal aggregate functions
Fixes possible segfault when non pushdownable aggregates are used in HAVING
Improves correctness of planning subqueries in HAVING
Prevents using old connections for security if citus.node_conninfo changed
Uses Microsoft approved cipher string for default TLS setup

citus v9.0.2 (March 6, 2020)

Fixes build errors on EL/OL 6 based distros
Fixes a bug that caused maintenance daemon to fail on standby nodes
Disallows distributed function creation when replication_model is statement

citus v9.2.2 (March 5, 2020)

Fixes a bug that caused some prepared stmts with function calls to fail
Fixes a bug that caused some prepared stmts with composite types to fail
Fixes a bug that caused missing subplan results in workers
Improves performance of re-partition joins

citus v9.2.1 (February 14, 2020)

Fixes a bug that could cause crashes if distribution key is NULL

citus v9.2.0 (February 10, 2020)

Adds support for INSERT...SELECT queries with re-partitioning
Adds citus.coordinator_aggregation_strategy to support more aggregates
Adds caching of local plans on shards for Citus MX
Adds compatibility support for dist. object infrastructure from old versions
Adds defering shard-pruning for fast-path router queries to execution
Adds propagation of GRANT ... ON SCHEMA queries
Adds support for CTE pushdown via CTE inlining in distributed planning
Adds support for ALTER TABLE ... SET SCHEMA propagation.
Adds support for DROP ROUTINE & ALTER ROUTINE commands
Adds support for any inner join on a reference table
Changes citus.log_remote_commands level to NOTICE
Disallows marking ref. table shards unhealthy in the presence of savepoints
Disallows placing new shards with shards in TO_DELETE state
Enables local execution of queries that do not need any data access
Fixes Makefile trying to cleanup PG directory during install
Fixes a bug causing errors when planning a query with multiple subqueries
Fixes a possible deadlock that could happen during shard moves
Fixes a problem when adding a new node due to tables referenced in func body
Fixes an issue that could cause joins with reference tables to be slow
Fixes cached metadata for shard is inconsistent issue
Fixes inserting multiple composite types as partition key in VALUES
Fixes unnecessary repartition on joins with more than 4 tables
Prevents wrong results for replicated partitioned tables after failure
Restricts LIMIT approximation for non-commutative aggregates

citus v9.1.2 (December 30, 2019)

Fixes a bug that prevents installation from source

citus v9.1.1 (December 18, 2019)

Fixes a bug causing SQL-executing UDFs to crash when passing in DDL
Fixes a bug that caused column_to_column_name to crash for invalid input
Fixes a bug that caused inserts into local tables w/ dist. subqueries to crash
Fixes a bug that caused some noop DML statements to fail
Fixes a bug that prevents dropping reference table columns
Fixes a crash in IN (.., NULL) queries
Fixes a crash when calling a distributed function from PL/pgSQL
Fixes an issue that caused CTEs to sometimes leak connections
Fixes strange errors in DML with unreachable sublinks
Prevents statements in SQL functions to run outside of a transaction

citus v9.1.0 (November 21, 2019)

Adds extensions to distributed object propagation infrastructure
Adds support for ALTER ROLE propagation
Adds support for aggregates in create_distributed_function
Adds support for expressions in reference joins
Adds support for returning RECORD in multi-shard queries
Adds support for simple IN subqueries on unique cols in repartition joins
Adds support for subqueries in HAVING clauses
Automatically distributes unary aggs w/ combinefunc and non-internal stype
Disallows distributed func creation when replication_model is 'statement'
Drops support for deprecated real-time and router executors
Fixes a bug in local execution that could cause missing rows in RETURNING
Fixes a bug that caused maintenance daemon to fail on standby nodes
Fixes a bug that caused other CREATE EXTENSION commands to take longer
Fixes a bug that prevented REFRESH MATERIALIZED VIEW
Fixes a bug when view is used in modify statements
Fixes a memory leak in adaptive executor when query returns many columns
Fixes underflow init of default values in worker extended op node creation
Fixes potential segfault in standard_planner inlining functions
Fixes an issue that caused failures in RHEL 6 builds
Fixes queries with repartition joins and group by unique column
Improves CTE/Subquery performance by pruning intermediate rslt broadcasting
Removes citus.worker_list_file GUC
Revokes usage from the citus schema from public

citus v9.0.1 (October 25, 2019)

Fixes a memory leak in the executor
Revokes usage from the citus schema from public

citus v9.0.0 (October 7, 2019)

Adds support for PostgreSQL 12
Adds UDFs to help with PostgreSQL upgrades
Distributes types to worker nodes
Introduces create_distributed_function UDF
Introduces local query execution for Citus MX
Implements infrastructure for routing CALL to MX workers
Implements infrastructure for routing SELECT function() to MX workers
Adds support for foreign key constraints between reference tables
Adds a feature flag to turn off CREATE TYPE propagation
Adds option citus.single_shard_commit_protocol
Adds support for EXPLAIN SUMMARY
Adds support for GENERATE ALWAYS AS STORED
Adds support for serial and smallserial in MX mode
Adds support for anon composite types on the target list in router queries
Avoids race condition between create_reference_table & master_add_node
Fixes a bug in schemas of distributed sequence definitions
Fixes a bug that caused run_command_on_colocated_placements to fail
Fixes a bug that leads to various issues when a connection is lost
Fixes a schema leak on CREATE INDEX statement
Fixes assert failure in bare SELECT FROM reference table FOR UPDATE in MX
Makes master_update_node MX compatible
Prevents pg_dist_colocation from multiple records for reference tables
Prevents segfault in worker_partition_protocol edgecase
Propagates ALTER FUNCTION statements for distributed functions
Propagates CREATE OR REPLACE FUNCTION for distributed functions
Propagates REINDEX on tables & indexes
Provides a GUC to turn of the new dependency propagation functionality
Uses 2PC in adaptive executor when dealing with replication factors above 1

citus v8.3.2 (August 09, 2019)

Fixes performance issues by skipping unnecessary relation access recordings

citus v8.3.1 (July 29, 2019)

Improves Adaptive Executor performance

citus v8.3.0 (July 10, 2019)

Adds a new distributed executor: Adaptive Executor
citus.enable_statistics_collection defaults to off (opt-in)
Adds support for CTEs in router planner for modification queries
Adds support for propagating SET LOCAL at xact start
Adds option to force master_update_node during failover
Deprecates master_modify_multiple_shards
Improves round robin logic on router queries
Creates all distributed schemas as superuser on a separate connection
Makes COPY adapt to connection use behaviour of previous commands
Replaces SESSION_LIFESPAN with configurable number of connections at xact end
Propagates ALTER FOREIGN TABLE commands to workers
Don't schedule tasks on inactive nodes
Makes DROP/VALIDATE CONSTRAINT tolerant of ambiguous shard extension
Fixes an issue with subquery map merge jobs as non-root
Fixes null pointers caused by partial initialization of ConnParamsHashEntry
Fixes errors caused by joins with shadowed aliases
Fixes a regression in outer joining subqueries introduced in 8.2.0
Fixes a crash that can occur under high memory load
Fixes a bug that selects wrong worker when using round-robin assignment
Fixes savepoint rollback after multi-shard modify/copy failure
Fixes bad foreign constraint name search
Fixes a bug that prevents stack size to be adjusted

citus v8.2.2 (June 11, 2019)

Fixes a bug in outer joins wrapped in subqueries

citus v8.2.1 (April 03, 2019)

Fixes a bug that prevents stack size to be adjusted

citus v8.1.2 (April 03, 2019)

Don't do redundant ALTER TABLE consistency checks at coordinator
Fixes a bug that prevents stack size to be adjusted
Fix an issue with some DECLARE .. CURSOR WITH HOLD commands

citus v8.2.0 (March 28, 2019)

Removes support and code for PostgreSQL 9.6
Enable more outer joins with reference tables
Execute CREATE INDEX CONCURRENTLY in parallel
Treat functions as transaction blocks
Add support for column aliases on join clauses
Skip standard_planner() for trivial queries
Added support for function calls in joins
Round-robin task assignment policy relies on local transaction id
Relax subquery union pushdown restrictions for reference tables
Speed-up run_command_on_shards()
Address some memory issues in connection config
Restrict visibility of get_*_active_transactions functions to pg_monitor
Don't do redundant ALTER TABLE consistency checks at coordinator
Queries with only intermediate results do not rely on task assignment policy
Finish connection establishment in parallel for multiple connections
Fixes a bug related to pruning shards using a coerced value
Fix an issue with some DECLARE .. CURSOR WITH HOLD commands
Fixes a bug that could lead to infinite recursion during recursive planning
Fixes a bug that could prevent planning full outer joins with using clause
Fixes a bug that could lead to memory leak on citus_relation_size
Fixes a problem that could cause segmentation fault with recursive planning
Switch CI solution to CircleCI

citus v8.0.3 (January 9, 2019)

Fixes maintenance daemon panic due to unreleased spinlock
Fixes an issue with having clause when used with complex joins

citus v8.1.1 (January 7, 2019)

Fixes maintenance daemon panic due to unreleased spinlock
Fixes an issue with having clause when used with complex joins

citus v8.1.0 (December 17, 2018)

Turns on ssl by default for new installations of citus
Restricts SSL Ciphers to TLS1.2 and above
Adds support for INSERT INTO SELECT..ON CONFLICT/RETURNING via coordinator
Adds support for round-robin task assignment for queries to reference tables
Adds support for SQL tasks using worker_execute_sql_task UDF with task-tracker
Adds support for VALIDATE CONSTRAINT queries
Adds support for disabling hash aggregate with HLL
Adds user ID suffix to intermediate files generated by task-tracker
Only allow transmit from pgsql_job_cache directory
Disallows GROUPING SET clauses in subqueries
Removes restriction on user-defined group ID in node addition functions
Relaxes multi-shard modify locks when enable_deadlock_prevention is disabled
Improves security in task-tracker protocol
Improves permission checks in internal DROP TABLE functions
Improves permission checks in cluster management functions
Cleans up UDFs and fixes permission checks
Fixes crashes caused by stack size increase under high memory load
Fixes a bug that could cause maintenance daemon panic

citus v8.0.2 (December 13, 2018)

Fixes a bug that could cause maintenance daemon panic
Fixes crashes caused by stack size increase under high memory load

citus v7.5.4 (December 11, 2018)

Fixes a bug that could cause maintenance daemon panic

citus v8.0.1 (November 27, 2018)

Execute SQL tasks using worker_execute_sql_task UDF when using task-tracker

citus v7.5.3 (November 27, 2018)

Execute SQL tasks using worker_execute_sql_task UDF when using task-tracker

citus v7.5.2 (November 14, 2018)

Fixes inconsistent metadata error when shard metadata caching get interrupted
Fixes a bug that could cause memory leak
Fixes a bug that prevents recovering wrong transactions in MX
Fixes a bug to prevent wrong memory accesses on Citus MX under very high load
Fixes crashes caused by stack size increase under high memory load

citus v8.0.0 (October 31, 2018)

Adds support for PostgreSQL 11
Adds support for applying DML operations on reference tables from MX nodes
Adds distributed locking to truncated MX tables
Adds support for running TRUNCATE command from MX worker nodes
Adds views to provide insight about the distributed transactions
Adds support for TABLESAMPLE in router queries
Adds support for INCLUDE option in index creation
Adds option to allow simple DML commands from hot standby
Adds support for partitioned tables with replication factor > 1
Prevents a deadlock on concurrent DROP TABLE and SELECT on Citus MX
Fixes a bug that prevents recovering wrong transactions in MX
Fixes a bug to prevent wrong memory accesses on Citus MX under very high load
Fixes a bug in MX mode, calling DROP SCHEMA with existing partitioned table
Fixes a bug that could cause modifying CTEs to select wrong execution mode
Fixes a bug preventing rollback in CREATE PROCEDURE
Fixes a bug on not being able to drop index on a partitioned table
Fixes a bug on TRUNCATE when there is a foreign key to a reference table
Fixes a performance issue in prepared INSERT..SELECT
Fixes a bug which causes errors on DROP DATABASE IF EXISTS
Fixes a bug to remove intermediate result directory in pull-push execution
Improves query pushdown planning performance
Evaluate functions anywhere in query

citus v7.5.1 (August 28, 2018)

Improves query pushdown planning performance
Fixes a bug that could cause modifying CTEs to select wrong execution mode

citus v7.4.2 (July 27, 2018)

Fixes a segfault in real-time executor during online shard move

citus v7.5.0 (July 25, 2018)

Adds foreign key support from hash distributed to reference tables
Adds SELECT ... FOR UPDATE support for router plannable queries
Adds support for non-partition columns in count distinct
Fixes a segfault in real-time executor during online shard move
Fixes ALTER TABLE ADD COLUMN constraint check
Fixes a bug where INSERT ... SELECT was allowed to update distribution column
Allows DDL commands to be sequentialized via citus.multi_shard_modify_mode
Adds support for topn_union_agg and topn_add_agg across shards
Adds support for hll_union_agg and hll_add_agg across shards
Fixes a bug that might cause shards to have a wrong owner
GUC select_opens_transaction_block defers opening transaction block on workers
Utils to implement DDLs for policies in future, warn about being unsupported
Intermediate results use separate connections to avoid interfering with tasks
Adds a node_conninfo GUC to set outgoing connection settings

citus v6.2.6 (July 06, 2018)

Adds support for respecting enable_hashagg in the master planner

citus v7.4.1 (June 20, 2018)

Fixes a bug that could cause transactions to incorrectly proceed after failure
Fixes a bug on INSERT ... SELECT queries in prepared statements

citus v7.4.0 (May 15, 2018)

Adds support for non-pushdownable subqueries and CTEs in UPDATE/DELETE queries
Adds support for pushdownable subqueries and joins in UPDATE/DELETE queries
Adds faster shard pruning for subqueries
Adds partitioning support to MX table
Adds support for (VACUUM | ANALYZE) VERBOSE
Adds support for multiple ANDs in HAVING for pushdown planner
Adds support for quotation needy schema names
Improves operator check time in physical planner for custom data types
Removes broadcast join logic
Deprecates large_table_shard_count and master_expire_table_cache()
Modifies master_update_node to lock write on shards hosted by node over update
DROP TABLE now drops shards as the currrent user instead of the superuser
Adds specialised error codes for connection failures
Improves error messages on connection failure
Fixes issue which prevented multiple citus_table_size calls per query
Tests are updated to use create_distributed_table

citus v7.2.2 (May 4, 2018)

Fixes a bug that could cause SELECTs to crash during a rebalance

citus v7.3.0 (March 15, 2018)

Adds support for non-colocated joins between subqueries
Adds support for window functions that can be pushed down to worker
Adds support for modifying CTEs
Adds recursive plan for subqueries in WHERE clause with recurring FROM clause
Adds support for bool_ and bit_ aggregates
Adds support for Postgres jsonb and json aggregation functions
Adds support for respecting enable_hashagg in the master plan
Adds support for renaming a distributed table
Adds support for ALTER INDEX (SET|RESET|RENAME TO) commands
Adds support for setting storage parameters on distributed tables
Performance improvements to reduce distributed planning time
Fixes a bug on planner when aggregate is used in ORDER BY
Fixes a bug on planner when DISTINCT (ON) clause is used with GROUP BY
Fixes a bug of creating coordinator planner with distinct and aggregate clause
Fixes a bug that could open a new connection on every table size function call
Fixes a bug canceling backends that are not involved in distributed deadlocks
Fixes count distinct bug on column expressions when used with subqueries
Improves error handling on worker node failures
Improves error messages for INSERT queries that have subqueries

citus v7.2.1 (February 6, 2018)

Fixes count distinct bug on column expressions when used with subqueries
Adds support for respecting enable_hashagg in the master plan
Fixes a bug canceling backends that are not involved in distributed deadlocks

citus v7.2.0 (January 16, 2018)

Adds support for CTEs
Adds support for subqueries that require merge step
Adds support for set operations (UNION, INTERSECT, ...)
Adds support for 2PC auto-recovery
Adds support for querying local tables in CTEs and subqueries
Adds support for more SQL coverage in subqueries for reference tables
Adds support for count(distinct) in queries with a subquery
Adds support for non-equijoins when there is already an equijoin for queries
Adds support for non-equijoins when there is already an equijoin for subquery
Adds support for real-time executor to run in transaction blocks
Adds infrastructure for storing intermediate distributed query results
Adds a new GUC named enable_repartition_joins for auto executor switch
Adds support for limiting the intermediate result size
Improves support for queries with unions containing filters
Improves support for queries with unions containing joins
Improves support for subqueries in the WHERE clause
Increases COPY throughput
Enables pushing down queries containing only recurring tuples and GROUP BY
Load-balance queries that read from 0 shards
Improves support for using functions in subqueries
Fixes a bug that could cause real-time executor to crash during cancellation
Fixes a bug that could cause real-time executor to get stuck on cancellation
Fixes a bug that could block modification queries unnecessarily
Fixes a bug that could cause assigning wrong IDs to transactions
Fixes a bug that could cause an assert failure with ANALYZE statements
Fixes a bug that could allow pushing down wrong set operations in subqueries
Fixes a bug that could cause a deadlock in create_distributed_table
Fixes a bug that could confuse user about ANALYZE usage
Fixes a bug that could lead to false positive distributed deadlock detections
Relaxes the locking for DDL commands on partitioned tables
Relaxes the locking on COPY with replication
Logs more remote commands when citus.log_remote_commands is set

citus v6.2.5 (January 11, 2018)

Fixes a bug that could crash the coordinator while reporting a remote error

citus v7.1.2 (January 4, 2018)

Fixes a bug that could cause assigning wrong IDs to transactions
Increases COPY throughput

citus v7.1.1 (December 1, 2017)

Fixes a bug that could prevent pushing down subqueries with reference tables
Fixes a bug that could create false positive distributed deadlocks
Fixes a bug that could prevent running concurrent COPY and multi-shard DDL
Fixes a bug that could mislead users about ANALYZE queries

citus v7.1.0 (November 14, 2017)

Adds support for native queries with multi shard UPDATE/DELETE queries
Expands reference table support in subquery pushdown
Adds window function support for subqueries and INSERT ... SELECT queries
Adds support for COUNT(DISTINCT) [ON] queries on non-partition columns
Adds support for DISTINCT [ON] queries on non-partition columns
Introduces basic usage statistic collector
Adds support for setting replica identity while creating distributed tables
Adds support for ALTER TABLE ... REPLICA IDENTITY queries
Adds pushdown support for LIMIT and HAVING grouped by partition key
Adds support for INSERT ... SELECT queries via worker nodes on MX clusters
Adds support for adding primary key using already defined index
Adds parameter to shard copy functions to support distinct replication models
Changes shard_name UDF to omit public schema name
Adds master_move_node UDF to make changes on nodename/nodeport more easy
Fixes a bug that could cause casting error with INSERT ... SELECT queries
Fixes a bug that could prevent upgrading servers from Citus 6.1
Fixes a bug that could prevent attaching partitions to a table in schema
Fixes a bug that could prevent adding a node to cluster with reference table
Fixes a bug that could cause a crash with INSERT ... SELECT queries
Fixes a bug that could prevent creating a partitoned table on Cloud
Implements various performance improvements
Adds internal infrastructures and tests to improve development process
Addresses various race conditions and deadlocks
Improves and standardizes error messages

citus v7.0.3 (October 16, 2017)

Fixes several bugs that could cause crash
Fixes a bug that could cause deadlock while creating reference tables
Fixes a bug that could cause false-positives in deadlock detection
Fixes a bug that could cause 2PC recovery not to work from MX workers
Fixes a bug that could cause cache incohorency
Fixes a bug that could cause maintenance daemon to skip cache invalidations
Improves performance of transaction recovery by using correct index

citus v7.0.2 (September 28, 2017)

Updates task-tracker to limit file access

citus v6.2.4 (September 28, 2017)

Updates task-tracker to limit file access

citus v6.1.3 (September 28, 2017)

Updates task-tracker to limit file access

citus v7.0.1 (September 12, 2017)

Fixes a bug that could cause memory leaks in INSERT ... SELECT queries
Fixes a bug that could cause incorrect execution of prepared statements
Fixes a bug that could cause excessive memory usage during COPY
Incorporates latest changes from core PostgreSQL code

citus v7.0.0 (August 28, 2017)

Adds support for PostgreSQL 10
Drops support for PostgreSQL 9.5
Adds support for multi-row INSERT
Adds support for router UPDATE and DELETE queries with subqueries
Adds infrastructure for distributed deadlock detection
Deprecates enable_deadlock_prevention flag
Adds support for partitioned tables
Adds support for creating UNLOGGED tables
Adds support for SAVEPOINT
Adds UDF citus_create_restore_point for taking distributed snapshots
Adds support for evaluating non-pushable INSERT ... SELECT queries
Adds support for subquery pushdown on reference tables
Adds shard pruning support for IN and ANY
Adds support for UPDATE and DELETE commands that prune down to 0 shard
Enhances transaction support by relaxing some transaction restrictions
Fixes a bug causing crash if distributed table has no shards
Fixes a bug causing crash when removing inactive node
Fixes a bug causing failure during COPY on tables with dropped columns
Fixes a bug causing failure during DROP EXTENSION
Fixes a bug preventing executing VACUUM and INSERT concurrently
Fixes a bug in prepared INSERT statements containing an implicit cast
Fixes several issues related to statement cancellations and connections
Fixes several 2PC related issues
Removes an unnecessary dependency causing warning messages in pg_dump
Adds internal infrastructure for follower clusters
Adds internal infrastructure for progress tracking
Implements various performance improvements
Adds internal infrastructures and tests to improve development process
Addresses various race conditions and deadlocks
Improves and standardizes error messages

citus v6.2.3 (July 13, 2017)

Fixes a crash during execution of local CREATE INDEX CONCURRENTLY
Fixes a bug preventing usage of quoted column names in COPY
Fixes a bug in prepared INSERTs with implicit cast in partition column
Relaxes locks in VACUUM to ensure concurrent execution with INSERT

citus v6.2.2 (May 31, 2017)

Fixes a common cause of deadlocks when repairing tables with foreign keys

citus v6.2.1 (May 24, 2017)

Relaxes version-check logic to avoid breaking non-distributed commands

citus v6.2.0 (May 16, 2017)

Increases SQL subquery coverage by pushing down more kinds of queries
Adds CustomScan API support to allow read-only transactions
Adds support for CREATE/DROP INDEX CONCURRENTLY
Adds support for ALTER TABLE ... ADD CONSTRAINT
Adds support for ALTER TABLE ... RENAME COLUMN
Adds support for DISABLE/ENABLE TRIGGER ALL
Adds support for expressions in the partition column in INSERTs
Adds support for query parameters in combination with function evaluation
Adds support for creating distributed tables from non-empty local tables
Adds UDFs to get size of distributed tables
Adds UDFs to add a new node without replicating reference tables
Adds checks to prevent running Citus binaries with wrong metadata tables
Improves shard pruning performance for range queries
Improves planner performance for joins involving co-located tables
Improves shard copy performance by creating indexes after copy
Improves task-tracker performance by batching several status checks
Enables router planner for queries on range partitioned table
Changes TRUNCATE to drop local data only if enable_ddl_propagation is off
Starts to execute DDL on coordinator before workers
Fixes a bug causing incorrectly reading invalidated cache
Fixes a bug related to creation of schemas of in workers with incorrect owner
Fixes a bug related to concurrent run of shard drop functions
Fixes a bug related to EXPLAIN ANALYZE with DML queries
Fixes a bug related to SQL functions in FROM clause
Adds a GUC variable to report cross shard queries
Fixes a bug related to partition columns without native hash function
Adds internal infrastructures and tests to improve development process
Addresses various race conditions and deadlocks
Improves and standardizes error messages

citus v6.1.2 (May 31, 2017)

Fixes a common cause of deadlocks when repairing tables with foreign keys

citus v6.1.1 (May 5, 2017)

Fixes a crash caused by router executor use after connection timeouts
Fixes a crash caused by relation cache invalidation during COPY
Fixes bug related to DDL use within PL/pgSQL functions
Fixes a COPY bug related to types lacking binary output functions
Fixes a bug related to modifications with parameterized partition values
Fixes improper value interpolation in worker sequence generation
Guards shard pruning logic against zero-shard tables
Fixes possible NULL pointer dereference and buffer underflow (via PVS-Studio)
Fixes a INSERT ... SELECT bug that could push down non-partition column JOINs

citus v6.1.0 (February 9, 2017)

Implements reference tables, transactionally replicated to all nodes
Adds upgrade_to_reference_table UDF to upgrade pre-6.1 reference tables
Expands prepared statement support to nearly all statements
Adds support for creating VIEWs which reference distributed tables
Adds targeted VACUUM/ANALYZE support
Adds support for the FILTER clause in aggregate expressions
Adds support for function evaluation within INSERT INTO ... SELECT
Adds support for creating foreign key constraints with ALTER TABLE
Adds logic to choose router planner for all queries it supports
Enhances create_distributed_table with parameter for explicit colocation
Adds generally useful utility UDFs previously available as "Citus Tools"
Adds user-facing UDFs for locking shard resources and metadata
Refactors connection and transaction management; giving consistent experience
Enhances COPY with fully transactional semantics
Improves support for cancellation for a number of queries and commands
Adds column_to_column_name UDF to help users understand partkey values
Adds master_disable_node UDF for temporarily disabling nodes
Adds proper MX ("masterless") metadata propagation logic
Adds start_metadata_sync_to_node UDF to propagate metadata changes to nodes
Enhances SERIAL compatibility with MX tables
Adds node_connection_timeout parameter to control node connection timeouts
Adds enable_deadlock_prevention setting to permit multi-node transactions
Adds a replication_model setting to specify replication of new tables
Changes the shard_replication_factor setting's default value to one
Adds code to automatically set max_prepared_transactions if not configured
Accelerates lookup of colocated shard placements
Fixes a bug affecting INSERT INTO ... SELECT queries using constant values
Fixes a bug by ensuring COPY does not mark placements inactive
Fixes a bug affecting reads from pg_dist_shard_placement table
Fixes a crash triggered by creating a foreign key without a column
Fixes a crash related to accessing catalog tables after aborted transactions
Fixes a bug affecting JOIN queries requiring repartitions
Fixes a bug affecting node insertions to pg_dist_node table
Fixes a crash triggered by queries with modifying common table expressions
Fixes a bug affecting workloads with concurrent shard appends and deletions
Addresses various race conditions and deadlocks
Improves and standardizes error messages

citus v6.0.1 (November 29, 2016)

Fixes a bug causing failures during pg_upgrade
Fixes a bug preventing DML queries during colocated table creation
Fixes a bug that caused NULL parameters to be incorrectly passed as text

citus v6.0.0 (November 7, 2016)

Adds compatibility with PostgreSQL 9.6, now the recommended version
Removes the pg_worker_list.conf file in favor of a pg_dist_node table
Adds master_add_node and master_add_node UDFs to manage membership
Removes the \stage command and corresponding csql binary in favor of COPY
Removes copy_to_distributed_table in favor of first-class COPY support
Adds support for multiple DDL statements within a transaction
Adds support for certain foreign key constraints
Adds support for parallel INSERT INTO ... SELECT against colocated tables
Adds support for the TRUNCATE command
Adds support for HAVING clauses in SELECT queries
Adds support for EXCLUDE constraints which include the partition column
Adds support for system columns in queries (tableoid, ctid, etc.)
Adds support for relation name extension within INDEX definitions
Adds support for no-op UPDATEs of the partition column
Adds several general-purpose utility UDFs to aid in Citus maintenance
Adds master_expire_table_cache UDF to forcibly expire cached shards
Parallelizes the processing of DDL commands which affect distributed tables
Adds support for repartition jobs using composite or custom types
Enhances object name extension to handle long names and large shard counts
Parallelizes the master_modify_multiple_shards UDF
Changes distributed table creation to error if the target table is not empty
Changes the pg_dist_shard.logicalrelid column from an oid to regclass
Adds a placementid column to pg_dist_shard_placement, replacing Oid use
Removes the pg_dist_shard.shardalias distribution metadata column
Adds pg_dist_partition.repmodel to track tables using streaming replication
Adds internal infrastructure to take snapshots of distribution metadata
Addresses the need to invalidate prepared statements on metadata changes
Adds a mark_tables_colocated UDF for denoting pre-6.0 manual colocation
Fixes a bug affecting prepared statement execution within PL/pgSQL
Fixes a bug affecting COPY commands using composite types
Fixes a bug that could cause crashes during EXPLAIN EXECUTE
Separates worker and master job temporary folders
Eliminates race condition between distributed modification and repair
Relaxes the requirement that shard repairs also repair colocated shards
Implements internal functions to track which tables' shards are colocated
Adds pg_dist_partition.colocationid to track colocation group membership
Extends shard copy and move operations to respect colocation settings
Adds pg_dist_local_group to prepare for future MX-related changes
Adds create_distributed_table to easily create shards and infer colocation

citus v5.2.2 (November 7, 2016)

Adds support for IF NOT EXISTS clause of CREATE INDEX command
Adds support for RETURN QUERY and FOR ... IN PL/pgSQL features
Extends the router planner to handle more queries
Changes COUNT of zero-row sets to return 0 rather than an empty result
Reduces the minimum permitted task_tracker_delay to a single millisecond
Fixes a bug that caused crashes during joins with a WHERE false clause
Fixes a bug triggered by unique violation errors raised in long transactions
Fixes a bug resulting in multiple registration of transaction callbacks
Fixes a bug which could result in stale reads of distribution metadata
Fixes a bug preventing distributed modifications in some PL/pgSQL functions
Fixes some code paths that could hypothetically read uninitialized memory
Lowers log level of waiting for activity messages

citus v5.2.1 (September 6, 2016)

Fixes subquery pushdown to properly extract outer join qualifiers
Addresses possible memory leak during multi-shard transactions

citus v5.2.0 (August 15, 2016)

Drops support for PostgreSQL 9.4; PostgreSQL 9.5 is required
Adds schema support for tables, other named objects (types, operators, etc.)
Evaluates non-immutable functions on master in all modification commands
Adds support for SERIAL types in non-partition columns
Adds support for RETURNING clause in INSERT, UPDATE, and DELETE commands
Adds support for multi-statement transactions involving a fixed set of nodes
Full SQL support for SELECT queries which can be executed on a single worker
Adds option to perform DDL changes using prepared transactions (2PC)
Adds an enable_ddl_propagation parameter to control DDL propagation
Accelerates shard pruning during merges
Adds master_modify_multiple_shards UDF to modify many shards at once
Adds COPY support for arrays of user-defined types
Now supports parameterized prepared statements for certain use cases
Extends LIMIT/OFFSET support to all executor types
Constraint violations now fail fast rather than hitting all placements
Makes master_create_empty_shard aware of shard placement policy
Reduces unnecessary sleep during queries processed by real-time executor
Improves task tracker executor's task cleanup logic
Relaxes restrictions on cancellation of DDL commands
Removes ONLY keyword from worker SELECT queries
Error message improvements and standardization
Moves master_update_shard_statistics function to pg_catalog schema
Fixes a bug where hash-partitioned anti-joins could return incorrect results
Now sets storage type correctly for foreign table-backed shards
Fixes master_update_shard_statistics issue with hash-partitioned tables
Fixes an issue related to extending table names that require escaping
Reduces risk of row counter overflows during modifications
Fixes a crash related to FILTER clause use in COUNT DISTINCT subqueries
Fixes crashes related to partition columns with high attribute numbers
Fixes certain subquery and join crashes
Detects flex for build even if PostgreSQL was built without it
Fixes assert-enabled crash when all_modifications_commutative is true

citus v5.2.0-rc.1 (August 1, 2016)

Initial 5.2.0 candidate

citus v5.1.1 (June 17, 2016)

Adds complex count distinct expression support in repartitioned subqueries
Improves task tracker job cleanup logic, addressing a memory leak
Fixes bug that generated incorrect results for LEFT JOIN queries
Improves compatibility with Debian's reproducible builds project
Fixes build issues on FreeBSD platforms

citus v5.1.0 (May 17, 2016)

Adds distributed COPY to rapidly populate distributed tables
Adds support for using EXPLAIN on distributed queries
Recognizes and fast-paths single-shard SELECT statements automatically
Increases INSERT throughput via shard pruning optimizations
Improves planner performance for joins involving tables with many shards
Adds ability to pass columns as arguments to function calls in UPDATEs
Introduces transaction manager for use by multi-shard commands
Adds COUNT(DISTINCT ...) pushdown optimization for hash-partitioned tables
Adds support for certain UNIQUE indexes on hash- or range-partitioned tables
Deprecates \stage in favor of using COPY for append-partition tables
Deprecates copy_to_distributed_table in favor of first-class COPY support
Fixes build problems when using non-packaged PostgreSQL installs
Fixes bug that sometimes skipped pruning when partitioned by a VARCHAR column
Fixes bug impeding use of user-defined functions in repartitioned subqueries
Fixes bug involving queries with equality comparisons of boolean types
Fixes crash that prevented use alongside pg_stat_statements
Fixes crash arising from SELECT queries that lack a target list
Improves warning and error messages

citus v5.1.0-rc.2 (May 10, 2016)

Fixes test failures
Fixes EXPLAIN output when FORMAT JSON in use

citus v5.1.0-rc.1 (May 4, 2016)

Initial 5.1.0 candidate

citus v5.0.1 (April 15, 2016)

Fixes issues on 32-bit systems

citus v5.0.0 (March 24, 2016)

Public release under AGPLv3
PostgreSQL extension compatible with PostgreSQL 9.5 and 9.4

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citus v12.1.5 (July 17, 2024)

citus v12.1.4 (May 28, 2024)

citus v12.1.3 (April 18, 2024)

citus v11.0.10 (February 15, 2024)

citus v12.1.2 (February 12, 2024)

citus v12.0.1 (July 11, 2023)

citus v11.3.1 (February 12, 2024)

citus v11.2.2 (February 12, 2024)

citus v11.1.7 (February 12, 2024)

citus v11.0.9 (February 12, 2024)

citus v12.1.1 (November 9, 2023)

citus v12.1.0 (September 12, 2023)

citus v12.0.0 (July 11, 2023)

citus v11.3.0 (May 2, 2023)

citus v11.2.1 (April 20, 2023)

citus v11.1.6 (April 20, 2023)

citus v11.0.8 (April 20, 2023)

citus v10.2.9 (April 20, 2023)

citus v10.1.6 (April 20, 2023)

citus v10.0.8 (April 20, 2023)

citus v9.5.12 (April 20, 2023)

citus v11.2.0 (January 30, 2023)

citus v11.1.5 (December 12, 2022)

citus v11.0.7 (November 8, 2022)

citus v11.1.4 (October 24, 2022)

citus v11.1.3 (October 14, 2022)

citus v11.1.2 (September 30, 2022)

citus v11.1.1 (September 16, 2022)

citus v11.1.0 (September 15, 2022)

citus v10.2.8 (August 19, 2022)

citus v11.0.6 (August 19, 2022)

citus v10.2.7 (August 19, 2022)

citus v11.0.5 (August 1, 2022)

citus v11.0.4 (July 13, 2022)

citus v11.0.3 (July 5, 2022)

citus v11.0.2 (June 15, 2022)

citus v10.2.5 (March 15, 2022)

citus v10.2.4 (February 1, 2022)

citus v10.1.4 (February 1, 2022)

citus v10.2.3 (November 29, 2021)

citus v10.0.6 (November 12, 2021)

citus v9.5.10 (November 8, 2021)

citus v9.5.9 (November 8, 2021)

citus v9.2.8 (November 4, 2021)

citus v9.2.7 (November 3, 2021)

citus v10.2.2 (October 14, 2021)

citus v10.2.1 (September 24, 2021)

citus v10.1.3 (September 17, 2021)

citus v9.5.8 (September 15, 2021)

citus v10.2.0 (September 14, 2021)

citus v10.1.2 (August 16, 2021)

citus v10.0.5 (August 16, 2021)

citus v9.5.7 (August 16, 2021)

citus v9.4.6 (August 8, 2021)

citus v10.1.1 (August 5, 2021)

citus v10.1.0 (July 14, 2021)

citus v10.0.4 (July 14, 2021)

citus v9.5.6 (July 8, 2021)

citus v9.5.5 (July 7, 2021)

citus v9.4.5 (July 7, 2021)

citus v8.3.3 (March 23, 2021)

citus v10.0.3 (March 16, 2021)

citus v10.0.2 (March 3, 2021)

citus v9.5.4 (February 19, 2021)

citus v10.0.1 (February 19, 2021)

citus v9.5.3 (February 16, 2021)

citus v10.0.0 (February 16, 2021)

citus v9.5.2 (January 26, 2021)

citus v9.4.4 (December 28, 2020)

citus v9.5.1 (December 1, 2020)

citus v9.4.3 (November 24, 2020)

citus v9.5.0 (November 10, 2020)

citus v9.4.2 (October 21, 2020)

citus v9.4.1 (September 30, 2020)