WinkerDu commented on PR #2142:
URL:
https://github.com/apache/arrow-datafusion/pull/2142#issuecomment-1087274996
> @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?
@jackwener @renato2099
I've check the behaviors of PG of SparkSQL, they all come out results with
`NULL`
- Spark 3.2
```
spark-sql> select 'a' || NULL || 'b';
NULL
```
- GP
```
# select 'a' || NULL || 'b';
?column?
----------
(1 row)
```
Seems here is a convention, I'll comply with it in later commit, thank you
both.
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