mayankshriv commented on a change in pull request #5798:
URL: https://github.com/apache/incubator-pinot/pull/5798#discussion_r465294347
##########
File path:
pinot-core/src/main/java/org/apache/pinot/core/query/aggregation/function/DistinctCountThetaSketchAggregationFunction.java
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@@ -387,12 +386,17 @@ public void aggregateGroupByMV(int length, int[][]
groupKeysArray, GroupByResult
public Map<String, Sketch> extractAggregationResult(AggregationResultHolder
aggregationResultHolder) {
Map<Predicate, Union> unionMap = aggregationResultHolder.getResult();
if (unionMap == null || unionMap.isEmpty()) {
- return Collections.emptyMap();
+ return null;
Review comment:
Yes, see merge(), there's a null check there. I had added
`Collections.emptyMap()` in the previous PR, only to realize that it could be
null. You are right it doesn't have to be null, but having it null saves a few
cpu cycles in merge, I guess.
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