leonardBang commented on a change in pull request #14863:
URL: https://github.com/apache/flink/pull/14863#discussion_r579912160
##########
File path:
flink-table/flink-table-runtime-blink/src/main/java/org/apache/flink/table/runtime/operators/deduplicate/DeduplicateFunctionHelper.java
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@@ -96,12 +109,20 @@ static void processLastRowOnChangelog(
currentRow.setRowKind(RowKind.INSERT);
out.collect(currentRow);
} else {
- if (generateUpdateBefore) {
- preRow.setRowKind(RowKind.UPDATE_BEFORE);
- out.collect(preRow);
+ if (!isStateTtlEnabled && equaliser.equals(preRow,
currentRow)) {
+ // currentRow is the same as preRow and state cleaning is
not enabled.
+ // We do not emit retraction and update message.
+ // If state cleaning is enabled, we have to emit messages
to prevent too early
+ // state eviction of downstream operators.
Review comment:
Got it, make sense to me
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