Jackie-Jiang commented on code in PR #17750:
URL: https://github.com/apache/pinot/pull/17750#discussion_r2843693342
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pinot-core/src/main/java/org/apache/pinot/core/query/aggregation/function/DistinctCountAggregationFunction.java:
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@@ -82,7 +82,7 @@ public ColumnDataType getFinalResultColumnType() {
@Override
public Integer extractFinalResult(Set intermediateResult) {
- return intermediateResult.size();
+ return intermediateResult == null ? 0 : intermediateResult.size();
Review Comment:
Sounds good. Let's match Postgres behavior
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