abhishekagarwal87 commented on a change in pull request #10653:
URL: https://github.com/apache/druid/pull/10653#discussion_r544947257
##########
File path:
processing/src/main/java/org/apache/druid/query/groupby/epinephelinae/RowBasedGrouperHelper.java
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@@ -712,13 +712,13 @@ public InputRawSupplierColumnSelectorStrategy
makeColumnSelectorStrategy(
return new StringInputRawSupplierColumnSelectorStrategy();
case LONG:
return
(InputRawSupplierColumnSelectorStrategy<BaseLongColumnValueSelector>)
- columnSelector -> columnSelector::getLong;
+ columnSelector -> () -> columnSelector.isNull() ? null :
columnSelector.getLong();
Review comment:
FYI, this change could cause a dip in performance when columns are
actually strings and being read as a number. Since the parsing first happens in
`isNull` function and then again in `getLong`
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