Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/14629
MySql do not allow select with 0 columns, and I think select() is useless,
no one will do such operation, so, is it better to generate compiling error
when detecting code use `df.select()` because it is usually a coding mistake?
Or, `df.select()` is useful in some particular scenario?
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