[GitHub] [calcite] DonnyZone commented on issue #1684: [CALCITE-3627] Incorrect null semantic for ROW function

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DonnyZone commented on issue #1684: [CALCITE-3627] Incorrect null semantic for ROW function
URL: https://github.com/apache/calcite/pull/1684#issuecomment-570499622
 
 
   Maybe we need more discussion on the case of all `null` elements for `ARRAY/ROW` function.
   ```
   [null, null, null] is null
   ```
   I investigated the query below in pg:
   ```
   select array[null, null, null] is null
   ```
   It returns `false`.
   
   The function's nullability seems to be a little different with that of row's struct type.
   What I am sure is the `NullPolicy` for `ROW` function should not be `ANY`.
   
   Hi, @zabetak @rubenada, I saw your in-depth discussion in [CALCITE-2464](https://issues.apache.org/jira/browse/CALCITE-2464),  could you help to confirm it? 

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