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[BugFix] Fix wrong plan in max(count(distinct)) when enable lowcardinality (backport #53403) #53419

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[BugFix] Fix wrong plan in max(count(distinct)) when enable lowcardinality (backport #53403) #53419

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5 changes: 3 additions & 2 deletions ...e/src/main/java/com/starrocks/sql/optimizer/rule/tree/AddDecodeNodeForDictStringRule.java
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Original file line number Diff line number Diff line change
Expand Up @@ -661,7 +661,9 @@ private PhysicalHashAggregateOperator rewriteAggOperator(PhysicalHashAggregateOp
if (canApplyDictDecodeOpt) {
CallOperator oldCall = kv.getValue();
int columnId = kv.getValue().getUsedColumns().getFirstId();
if (context.needRewriteMultiCountDistinctColumns.contains(columnId)) {
final String fnName = kv.getValue().getFnName();
if (context.needRewriteMultiCountDistinctColumns.contains(columnId)
&& fnName.equals(FunctionSet.MULTI_DISTINCT_COUNT)) {
// we only need rewrite TFunction
Type[] newTypes = new Type[] {ID_TYPE};
AggregateFunction newFunction =
Expand All @@ -678,7 +680,6 @@ private PhysicalHashAggregateOperator rewriteAggOperator(PhysicalHashAggregateOp

List<ScalarOperator> newArguments = Collections.singletonList(dictColumn);
Type[] newTypes = newArguments.stream().map(ScalarOperator::getType).toArray(Type[]::new);
String fnName = kv.getValue().getFnName();
AggregateFunction newFunction =
(AggregateFunction) Expr.getBuiltinFunction(kv.getValue().getFnName(), newTypes,
Function.CompareMode.IS_NONSTRICT_SUPERTYPE_OF);
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5 changes: 5 additions & 0 deletions fe/fe-core/src/test/java/com/starrocks/sql/plan/LowCardinalityTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -393,6 +393,11 @@ public void testDecodeNodeRewriteMultiCountDistinct() throws Exception {
plan = getFragmentPlan(sql);
Assert.assertTrue(plan.contains(" multi_distinct_count(11: S_ADDRESS), " +
"multi_distinct_count(12: S_COMMENT)"));

sql = "select max(a) from (select count(distinct S_ADDRESS) a from supplier)t";
plan = getFragmentPlan(sql);
assertContains(plan, "multi_distinct_count(9: count)");

connectContext.getSessionVariable().setNewPlanerAggStage(3);
sql = "select max(S_ADDRESS), count(distinct S_ADDRESS) from supplier group by S_ADDRESS;";
plan = getFragmentPlan(sql);
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