yux created FLINK-36956:
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Summary: Pipeline transform should deduce PK column types to be
NOT NULL
Key: FLINK-36956
URL: https://issues.apache.org/jira/browse/FLINK-36956
Project: Flink
Issue Type: Bug
Components: Flink CDC
Affects Versions: cdc-3.2.1
Reporter: yux
Currently, specifying primary key columns in Transform block does not affect
its nullability attribute. However, most structured sink databases do not allow
appointing a NULLable column as PK.
Setting PK attribute in transform rules also make these columns NOT NULL
implicitly would make more sense.
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