lincoln-lil commented on issue #9335: [FLINK-13503][API] Add contract in `LookupableTableSource` to specify the behavior when lookupKeys contains null. URL: https://github.com/apache/flink/pull/9335#issuecomment-517618200 If I understand this issue correctly, should it just convert the `null` key into `xx is null` clause for `JDBCLookupFunction` instead of `is not distinct from` clause or other variant?
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