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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2021/09/20 18:05:57 UTC

[GitHub] [arrow-datafusion] alamb commented on issue #998: implement Set Operations UNION

alamb commented on issue #998:
URL: https://github.com/apache/arrow-datafusion/issues/998#issuecomment-923155977


   Another potential way to implement `UNION` might be to rewrite the logical plan to the equivalent of:
   
   `SELECT x from foo UNION select x from bar` 
   --> 
   `SELECT distinct (select x from foo UNION ALL select x from bar)`
   
   
   
   `


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