dongjoon-hyun commented on pull request #31499:
URL: https://github.com/apache/spark/pull/31499#issuecomment-779383014
1. For the first your example, `[ NOSCAN | FOR COLUMNS col [ , ... ] | FOR
ALL COLUMNS ]` means we can omit all. So, we cannot write like that here.
2. For the second example, you mean `{}` is correct for this case because
`(` and `)` is used as literal. Did I understand correctly?
+1 for your suggestion (2).
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