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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