[jira] [Created] (FLINK-38217) ChangelogNormalize unnecessarily emits updates for equal rows

["Dawid Wysakowicz (Jira)" <ji...@apache.org>]

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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