shenyu0127 commented on code in PR #11365:
URL: https://github.com/apache/pinot/pull/11365#discussion_r1299602323
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pinot-core/src/main/java/org/apache/pinot/core/query/aggregation/function/VarianceAggregationFunction.java:
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@@ -134,12 +169,7 @@ public void aggregateGroupByMV(int length, int[][]
groupKeysArray, GroupByResult
@Override
public VarianceTuple extractAggregationResult(AggregationResultHolder
aggregationResultHolder) {
- VarianceTuple varianceTuple = aggregationResultHolder.getResult();
- if (varianceTuple == null) {
- return new VarianceTuple(0L, 0.0, 0.0);
- } else {
- return varianceTuple;
- }
+ return aggregationResultHolder.getResult();
Review Comment:
We don't need to check if `_nullHandlingEnabled` is set here. This is
because we want to return NULL (not `-infi`) if `_nullHandlingEnabled` is false
and no matching row is found.
There was a bug in my previous commit: if `_nullHandlingEnabled` is false
and no matching row is found, it would return NaN. I fixed it by modifying
other places.
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