beyond1920 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-518099258 @wuchong > could you also update InMemoryAsyncLookupFunction#eval and InMemoryLookupFunction#eval to throw exception when one of the argument is null？ Hi, JarkWu, InMemoryAsyncLookupFunction and InMemoryLookupFunction lookup records with null value on the lookup key field when argument contains null, which complies with the contract mentioned in https://github.com/apache/flink/pull/9335/files, I think the behavior is also reasonable.
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