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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/03/25 08:32:40 UTC

[GitHub] [arrow-datafusion] Ted-Jiang commented on issue #1818: A corner bug in union

Ted-Jiang commented on issue #1818:
URL: https://github.com/apache/arrow-datafusion/issues/1818#issuecomment-1078778970


   @xudong963 @alamb  in pg
   ```
   postgres=# select 1 as a union all select 2 as b;
    a
   ---
    1
    2
   (2 rows)
   
   ```
   in DF
   https://github.com/apache/arrow-datafusion/blob/0194a27d0f68108c20b12456e9dafadbb170085e/datafusion/src/logical_plan/builder.rs#L1049
   
   then 
   https://github.com/apache/arrow-datafusion/blob/634252b44cec8dc904e48926d0aa54feeb4d48af/datafusion-common/src/dfschema.rs#L278-L282
   we check field name, according to the below link should we change to check the filed type are compatible?
   
   https://www.postgresql.org/docs/13/sql-select.html#:~:text=specified%20with%20DISTINCT.-,UNION%20Clause,a%20UNION%20result%20or%20for%20any%20input%20of%20a%20UNION.,-INTERSECT%20Clause


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