beyond1920 edited a comment 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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