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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