wuchong commented on a change in pull request #9120:
[FLINK-13216][FLINK-13153][table-planner-blink] Fix Max_Retract and Min_Retract
may produce incorrect result
URL: https://github.com/apache/flink/pull/9120#discussion_r303715390
##########
File path:
flink-table/flink-table-planner-blink/src/main/java/org/apache/flink/table/functions/aggfunctions/MaxWithRetractAggFunction.java
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@@ -135,6 +135,8 @@ private void updateMax(MaxWithRetractAccumulator<T> acc)
throws Exception {
// when both of them are expired.
Review comment:
Yes. This is the problem. We should set max to null when the map is empty.
The "expired" means the content of MapView might be cleared because of state
ttl.
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