HaoYang670 commented on PR #3608:
URL:
https://github.com/apache/arrow-datafusion/pull/3608#issuecomment-1257179698
> However, I think it is worth considering handling nulls in positions other
than the first as well
@alamb, if the separator is `null`, the `concat_ws` expression will always
have the value `null`,
If `null` appears in other positions, then the `null` value will be ignored:
```
concat_ws(" | ", col1, null, col2) --> concat_ws("|", col1, col2)
```
So we should only check `null` at the first position
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