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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2019/10/07 17:54:22 UTC
[GitHub] [spark] cloud-fan commented on issue #26034: [SPARK-29364][SQL]
Return an interval from date subtract according to SQL standard
cloud-fan commented on issue #26034: [SPARK-29364][SQL] Return an interval from date subtract according to SQL standard
URL: https://github.com/apache/spark/pull/26034#issuecomment-539129965
I looked into this problem a while ago. IIRC some DBs do not support `dateValue - dateValue`, they can only subtract date values via functions like `datediff`.
The SQL standard defines the behavior of `dateValue - dateValue`, but not a specific function. It seems that the common behavior of the `datediff` function is to return a int, shall we keep it and only change `dateValue - dateValue`?
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