cloud-fan commented on issue #25136: [SPARK-28322][SQL] Add support to Decimal 
type for integral divide
URL: https://github.com/apache/spark/pull/25136#issuecomment-522567563
 
 
   Well, we can say this is a new feature if you think "behavior change" is too 
strong.
   
   I don't like the statement that "MySQL, Oracle and Postgres support it, so 
Spark should support it as well". I want to see a story that drives this 
feature request.
   
   In Spark, we have `/` and `div`. `/` is for fractional division and `div` is 
for integral division. I think this is a good story. If we make `div` support 
decimal, then we create confusion: what operator users should pick if they want 
to divide 2 decimals?
   
   For example, "`div` should just be an alias of `/`" is also a good story to 
me, if that's what happened in MySQL, Oracle and Postgres.

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