Dawid Wysakowicz created FLINK-38217:
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Summary: ChangelogNormalize unnecessarily emits updates for equal
rows
Key: FLINK-38217
URL: https://issues.apache.org/jira/browse/FLINK-38217
Project: Flink
Issue Type: Bug
Components: Table SQL / Runtime
Affects Versions: 1.20.2, 1.19.3, 2.0.0
Reporter: Dawid Wysakowicz
DeduplicateFunctionHelper has logic for skipping rows if the previous emitted
row is the same as the new incoming record:
*
https://github.com/apache/flink/blob/e36309a420c4c30ad98026c192881784edc58b7f/flink-table/flink-table-runtime/src/main/java/org/apache/flink/table/runtime/operators/deduplicate/utils/DeduplicateFunctionHelper.java#L120
*
https://github.com/apache/flink/blob/e36309a420c4c30ad98026c192881784edc58b7f/flink-table/flink-table-runtime/src/main/java/org/apache/flink/table/runtime/operators/deduplicate/utils/DeduplicateFunctionHelper.java#L179
Unfortunately it has a bug that it compares the entire Row including the
RowKind. The Row stored in the state has always {{INSERT}} RowKind whereas the
incoming records will have {{UPDATE_AFTER}} causing this optimisation to never
trigger.
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