[jira] [Created] (FLINK-20205) CDC source shouldn't send UPDATE_BEFORE messages if the downstream doesn't need it

[Shang Yuanchun (Jira)]

Jark Wu created FLINK-20205:
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             Summary: CDC source shouldn't send UPDATE_BEFORE messages if the downstream doesn't need it
                 Key: FLINK-20205
                 URL: https://issues.apache.org/jira/browse/FLINK-20205
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / Planner
            Reporter: Jark Wu
             Fix For: 1.12.0


Currently, the CDC source will always generate UPDATE_BEFORE and UPDATE_AFTER messages for update. However, many downstream operators don't need the UDPATE_BEFORE, e.g. temporal join and upsert sink. Currently, {{debezium-cdc-source => upsert-kafka}} will generate lots of tombstone messages, which is quite not efficient.  



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