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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2019/03/28 08:25:10 UTC

[GitHub] [spark] ueshin opened a new pull request #24236: [SPARK-27314][SQL] Deduplicate exprIds for Union.

ueshin opened a new pull request #24236: [SPARK-27314][SQL] Deduplicate exprIds for Union.
URL: https://github.com/apache/spark/pull/24236
 
 
   ## What changes were proposed in this pull request?
   
   We have been having a potential problem with `Union` when the children have the same expression id in their outputs, which happens when self-union.
   
   ## How was this patch tested?
   
   Modified some tests to adjust plan changes.
   

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