wuchong commented on issue #9285: [FLINK-13433][table-planner-blink] Do not fetch data from LookupableTableSource if the JoinKey in left side of LookupJoin contains null value. URL: https://github.com/apache/flink/pull/9285#issuecomment-518100107 I agree with you @beyond1920 , however, I want to have some test to cover we didn't push any nulls into `LookupFunction`. That's why I want to add such check in `InMemoryLookupFunction`. We can remove the check when we support push `is null` into LookupFunction?
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