Dawid Wysakowicz created FLINK-39078:
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Summary: Disallow ON CONFLICT for non upsert sinks
Key: FLINK-39078
URL: https://issues.apache.org/jira/browse/FLINK-39078
Project: Flink
Issue Type: Sub-task
Components: Table SQL / API
Reporter: Dawid Wysakowicz
Assignee: Dawid Wysakowicz
Fix For: 2.3.0
ON CONFLICT clause should be allowed only for upsert sinks. In other cases it
may be silently ignored which may cause confusion, especially in case where the
sink is append only with primary key.
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