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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/04/03 16:59:01 UTC

[GitHub] [arrow-datafusion] WinkerDu edited a comment on pull request #2142: implement 'StringConcat' operator to support sql like "select 'aa' || 'b' "

WinkerDu edited a comment on pull request #2142:
URL: https://github.com/apache/arrow-datafusion/pull/2142#issuecomment-1086892111


   @jackwener thank you for your comment.
   I'm not sure what PG behaves like is reasonable, PG build-in expression `concat` can take `NULL` like
   ```
   select concat('aa', NULL, 'b');
    concat 
   --------
    aab
   (1 row)
   ```
   I prefer unify the outputs of `||` and `concat`, what other contributors think of?


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