JingsongLi commented on a change in pull request #9331:
[FLINK-13523][table-planner-blink] Verify and correct arithmetic function's
semantic for Blink planner
URL: https://github.com/apache/flink/pull/9331#discussion_r311892542
##########
File path:
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/plan/rules/logical/SplitAggregateRule.scala
##########
@@ -303,7 +302,22 @@ class SplitAggregateRule extends RelOptRule(
aggGroupCount + index + avgAggCount + 1,
finalAggregate.getRowType)
avgAggCount += 1
- relBuilder.call(FlinkSqlOperatorTable.DIVIDE, sumInputRef,
countInputRef)
+ // Make a guarantee that the final aggregation returns NULL if
underlying count is ZERO.
Review comment:
Need modify comments of `SplitAggregateRule` too?
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