[GitHub] [flink] JingsongLi 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.

[GitBox <gi...@apache.org>]

JingsongLi 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-516738710
 
 
   I am interested to sql: `SELECT T.id, T.len, T.content, D.name FROM T JOIN userTable for system_time as of T.proctime AS D ON T.id = D.id OR (T.id is null and D.id is null)`.
   Does it work?

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