diff --git a/packages/malloy/src/dialect/snowflake/dialect_functions.ts b/packages/malloy/src/dialect/snowflake/dialect_functions.ts
index ead6bfa5b..7aa1c967e 100644
--- a/packages/malloy/src/dialect/snowflake/dialect_functions.ts
+++ b/packages/malloy/src/dialect/snowflake/dialect_functions.ts
@@ -10,10 +10,14 @@ import {
   def,
   DefinitionBlueprintMap,
   OverloadedDefinitionBlueprint,
+  TypeDescBlueprint,
   arg as a,
   sql,
 } from '../functions/util';
 
+// Cute shortcut So you can write things like: {array: T} and {dimension: T}
+const T: TypeDescBlueprint = {generic: 'T'};
+
 const order_by: AggregateOrderByNode = {
   node: 'aggregate_order_by',
   prefix: ' WITHIN GROUP(',
@@ -62,6 +66,38 @@ const string_agg_distinct: OverloadedDefinitionBlueprint = {
 export const SNOWFLAKE_DIALECT_FUNCTIONS: DefinitionBlueprintMap = {
   string_agg,
   string_agg_distinct,
+  hll_accumulate: {
+    default: {
+      takes: {'value': {dimension: T}},
+      returns: {measure: {sql_native: 'hyperloglog'}},
+      generic: {
+        'T': ['string', 'number'],
+      },
+      isSymmetric: true,
+      impl: {function: 'hll_accumulate'},
+    },
+  },
+  hll_combine: {
+    takes: {'value': {sql_native: 'hyperloglog'}},
+    returns: {measure: {sql_native: 'hyperloglog'}},
+    impl: {function: 'hll_combine'},
+    isSymmetric: true,
+  },
+  hll_estimate: {
+    takes: {'value': {sql_native: 'hyperloglog'}},
+    returns: {dimension: 'number'},
+    impl: {function: 'hll_estimate'},
+  },
+  hll_export: {
+    takes: {'value': {sql_native: 'hyperloglog'}},
+    returns: {dimension: {sql_native: 'bytes'}},
+    impl: {function: 'hll_export'},
+  },
+  hll_import: {
+    takes: {'value': {sql_native: 'bytes'}},
+    returns: {dimension: {sql_native: 'hyperloglog'}},
+    impl: {function: 'hll_import'},
+  },
   ...def('repeat', {'str': 'string', 'n': 'number'}, 'string'),
   ...def('reverse', {'str': 'string'}, 'string'),
 };
diff --git a/packages/malloy/src/dialect/snowflake/snowflake.ts b/packages/malloy/src/dialect/snowflake/snowflake.ts
index c0328c36e..b0127f7b4 100644
--- a/packages/malloy/src/dialect/snowflake/snowflake.ts
+++ b/packages/malloy/src/dialect/snowflake/snowflake.ts
@@ -116,6 +116,7 @@ export class SnowflakeDialect extends Dialect {
   supportsSafeCast = true;
   supportsNesting = true;
   defaultSampling = {rows: 50000};
+  supportsHyperLogLog = true;
 
   // NOTE: safely setting all these to false for now
   // more many be implemented in future
diff --git a/test/src/databases/bigquery/malloy_query.spec.ts b/test/src/databases/bigquery/malloy_query.spec.ts
index 8dd5f7a54..e63ba367b 100644
--- a/test/src/databases/bigquery/malloy_query.spec.ts
+++ b/test/src/databases/bigquery/malloy_query.spec.ts
@@ -750,15 +750,6 @@ describe('airport_tests', () => {
     `).malloyResultMatches(model, {'pipe_turtle.total_airports': 1845});
   });
 
-  it('hyperloglog combine', async () => {
-    await expect(`run: bigquery.table('malloytest.airports')->{
-        aggregate: code_hll is hll_accumulate(code)
-    } -> {
-        aggregate: code_count is hll_estimate(hll_combine(code_hll))
-    }
-    `).malloyResultMatches(runtime, {code_count: 19799});
-  });
-
   it.skip('crossjoined turtles', async () => {
     // const result = await runQuery(model,`
     //     explore airports