DonnyZone commented on pull request #1971:
URL: https://github.com/apache/calcite/pull/1971#issuecomment-626447764


   Thanks for pushing this work forward. I ever tried (but failed) to find some 
similar functions in other DB products. This makes me confused about whether we 
should treat `[null, null, .., null]` as `null`.
   That is, to introduce `NullPolicy.ALL` or use `NullPolicy.NONE`? At least, 
current `NullPolicy.ANY` is wrong.
   Personally, I'm inclined to introduce `NullPolicy.ALL`, as it follows SQL 
standard.
   Also cc @rubenada @zabetak 


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