fix error handling of DuckDB::Appender#append_null

[suketa]

Summary by CodeRabbit

• Bug Fixes

  • Improved error messages to clearly indicate when data appending operations fail.

• New Features

  • Introduced functionality to append text values with a specified length.
  • Replaced an older method for appending null values with an updated variant that offers consistent error handling.

• Documentation

  • Updated usage examples and method descriptions to reflect the new appending capabilities.

[coderabbitai]

Walkthrough

This change updates error reporting and method naming in the DuckDB::Appender class. The error message for failures now references both append_blob and append_null. In the C implementation, the function formerly named appender_append_null is renamed to appender__append_null with simplified error handling, and its public exposure is replaced by a private method registration. In the Ruby layer, the method signature has been updated by removing the old append_varchar_length and introducing append_null (with documentation updates), while a new method for appending a varchar value is also added.

Changes

File(s)	Change Summary
CHANGELOG.md	Updated error message to include both DuckDB::Appender#append_blob and DuckDB::Appender#append_null.
ext/duckdb/appender.c	Renamed appender_append_null to appender__append_null; simplified error handling by directly returning a converted boolean value; updated public/private method registration.
lib/duckdb/appender.rb	Replaced the old append_varchar_length method with a new append_null; introduced a new method for appending a varchar value with a specified length; updated documentation.

Sequence Diagram(s)

sequenceDiagram
    participant Ruby as Ruby Code
    participant App as DuckDB::Appender
    participant CFunc as appender__append_null (C)

    Ruby->>App: call append_null
    App->>CFunc: forward call to _append_null
    CFunc-->>App: return boolean result (success/failure)
    alt Successful append
       App->>Ruby: return self
    else Append failure
       App->>Ruby: raise error ("Failure in append_blob, append_null")
    end

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Possibly related PRs

• fix error handling of DuckDB::Appender#append_blob #900: Addresses error handling for append_blob and append_null, directly aligning with these changes in error reporting.
• fix error handling of DuckDB::Appender#append_float #897: Modifies error handling for append_float, demonstrating a similar approach to improving error messages within the DuckDB::Appender class.
• change error handling of DuckDB::Appender#append_uint8 #871: Updates error messages for various append methods, including append_uint8, showing overlapping enhancements in error reporting.

Poem

I'm a happy rabbit, leaping through the code,
Hopping over bugs on every winding road.
Now _append_null sings a clear, refined tune,
With error messages that shine like the moon.
I hop with glee—cheers to fixes that make our code bloom! 🐇

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📜 Recent review details

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Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 7600077 and fd09e28.

📒 Files selected for processing (3)

• CHANGELOG.md (1 hunks)
• ext/duckdb/appender.c (4 hunks)
• lib/duckdb/appender.rb (2 hunks)

🧰 Additional context used

🧠 Learnings (1)

CHANGELOG.md (1)

Learnt from: suketa
PR: suketa/ruby-duckdb#871
File: ext/duckdb/appender.c:170-178
Timestamp: 2025-01-26T00:37:44.001Z
Learning: In ruby-duckdb's DuckDB::Appender#append_uint8, values larger than uint8 max (255) are silently truncated to maintain backward compatibility, following C's implicit truncation behavior. Range checking is intentionally omitted to avoid breaking changes.

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🔇 Additional comments (6)

CHANGELOG.md (1)

12-12: LGTM - Properly documented method error handling improvement.

The addition of DuckDB::Appender#append_null to the list of methods with improved error messages is correctly documented and consistent with the implementation changes.

lib/duckdb/appender.rb (2)

349-367: LGTM - New append_varchar_length method provides useful functionality.

The new method follows the consistent pattern used in the class with proper error handling and documentation. It provides more control over varchar data handling by allowing length specification.

---

389-407: LGTM - Improved append_null implementation with proper error handling.

The updated implementation properly handles errors and follows the consistent pattern used throughout the class. The documentation has been updated to clearly explain its purpose with a simple example that focuses on appending NULL values.

ext/duckdb/appender.c (3)

24-24: LGTM - Updated function name follows consistent naming convention.

The rename to appender__append_null aligns with the double underscore convention used for private methods in this file.

---

264-270: LGTM - Simplified implementation with consistent documentation.

The function is now properly marked with :nodoc: and the implementation has been streamlined to directly return the result of the operation, which is both more concise and maintainable.

---

427-427: LGTM - Correct method registration as private.

The method is now properly registered as a private method using the correct naming convention, consistent with other private methods in the class.

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