[jira] [Created] (FLINK-13433) Do not fetch data from LookupableTableSource if the JoinKey in left side of LookupJoin contains null value

[Jing Zhang (JIRA)]

Jing Zhang created FLINK-13433:
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             Summary: Do not fetch data from LookupableTableSource if the 
JoinKey in left side of LookupJoin contains null value
                 Key: FLINK-13433
                 URL: https://issues.apache.org/jira/browse/FLINK-13433
             Project: Flink
          Issue Type: Task
          Components: Table SQL / Planner
    Affects Versions: 1.9.0, 1.10.0
            Reporter: Jing Zhang
             Fix For: 1.10.0


For LookupJoin, if joinKey in left side of a LeftOuterJoin/InnerJoin contains 
null values, there is no need to fetch data from `LookupableTableSource`. 
However, we don't shortcut the fetch function under the case at present, the 
correctness of results depends on the `TableFunction` implementation of  each 
`LookupableTableSource`.



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