Github user KurtYoung commented on a diff in the pull request:
https://github.com/apache/flink/pull/3111#discussion_r96329552
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/rules/FlinkRuleSets.scala
---
@@ -96,6 +96,13 @@ object FlinkRuleSets {
ProjectToCalcRule.INSTANCE,
CalcMergeRule.INSTANCE,
+ // distinct aggregate rule for FLINK-3475
--- End diff --
I think this comment can move to
`FlinkAggregateExpandDistinctAggregatesRule`, and open a jira to track to
remove this class after we upgrade Calcite.
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