Github user hvanhovell commented on the issue:
https://github.com/apache/spark/pull/18069
I don't think this makes any sense:
- The parser is not the place where you should make this change. This
should be done in `TypeCoercion`. Now we create different semantics between SQL
and the DataFrame API.
- This is a breaking change to result type of `Divide`, and will probably
break Hive compatibility. This is going break to user code in a lot of places.
I also think it is weird that we are going to always return `Double` when a
`Decimal` is completely valid.
- I think MySql returns a `Decimal` and not a `Double`.
So I am going to -1 this.
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