[GitHub] flink issue #4858: [FLINK-7755] [table] Fix NULL handling in batch joins.

[fhueske]

Github user fhueske commented on the issue:

    https://github.com/apache/flink/pull/4858
  
    Thanks for the review @twalthr. 
    The docs don't need to be touched. The previous restrictions were not 
documented...
    
    Will merge this PR.


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