Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/15937
Hi @rxin, actually, I found another wrong example in `ConcatWs` before.
in `stringExpressions.scala`
```diff
- > SELECT _FUNC_(' ', Spark', 'SQL');
+ > SELECT _FUNC_(' ', 'Spark', 'SQL');
```
There were plenty of wrong examples fixed in the last PR but it seems I
missed some.
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