snuyanzin commented on code in PR #23685:
URL: https://github.com/apache/flink/pull/23685#discussion_r1402650157
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flink-table/flink-table-planner/src/main/scala/org/apache/flink/table/planner/plan/rules/logical/FlinkSubQueryRemoveRule.scala:
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@@ -216,6 +216,18 @@ class FlinkSubQueryRemoveRule(
// EXISTS and NOT EXISTS
case SqlKind.EXISTS =>
+ // If the sub-query is guaranteed to produce at least one row, just
return TRUE.
+ // If the sub-query is guaranteed to produce no rows then return FALSE.
Review Comment:
oops, seems I missed, it
makes, sense, thanks
done
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