yuxiqian commented on code in PR #3932:
URL: https://github.com/apache/flink-cdc/pull/3932#discussion_r1981288806
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flink-cdc-runtime/src/main/java/org/apache/flink/cdc/runtime/operators/transform/PreTransformOperator.java:
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@@ -270,6 +273,24 @@ public void close() throws Exception {
@Override
public void processElement(StreamRecord<Event> element) throws Exception {
Event event = element.getValue();
+ if (event instanceof ChangeEvent) {
Review Comment:
If I understand correctly, after this change, MySQL source will always emit
`CreateTableEvent` based on current tables' schema, before sending any
`DataChangeEvent`s.
As `event instanceof ChangeEvent` is `true`, we will emit a
`CreateTableEvent` restored from `PreTransformOp`'s state.
But the following `event instanceof CreateTableEvent` (L294) is also `true`.
Are we accidentally emitting duplicate and inconsistent `CreateTableEvent`s to
the downstream?
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