beyond1920 edited a comment 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-517621847 @lincoln-lil The issue aims to specify the behavior when the lookupKeys contains null value. It has no relationship with `is not distinct from` clause.
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