julianhyde commented on issue #1178: [CALCITE-3013] support CeilFuncBigInt 
<BIGINT> TO <TIME_UNIT>
URL: https://github.com/apache/calcite/pull/1178#issuecomment-490589560
 
 
   I don't see a need for this function. The SQL standard tries hard to 
maintain the abstraction that datetime values are NOT just milliseconds since 
1970 (and it succeeds).
   
   If you want to add a user-defined function (not in Calcite) you can do it. 
It you do it right it will probably optimize to a few machine instructions.
   
   Let's continue discussion at 
https://issues.apache.org/jira/browse/CALCITE-3013 rather than in github.

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