Github user mn-mikke commented on a diff in the pull request:
https://github.com/apache/spark/pull/21103#discussion_r206228544
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -3651,14 +3651,9 @@ case class ArrayDistinct(child: Expression)
}
/**
- * Will become common base class for [[ArrayUnion]], ArrayIntersect, and
ArrayExcept.
+ * Will become common base class for [[ArrayUnion]], ArrayIntersect, and
[[ArrayExcept]].
*/
abstract class ArraySetLike extends BinaryArrayExpressionWithImplicitCast {
--- End diff --
I'm not sure to what level Presto is considered as a reference. Just FYI
these operations in Presto can accept arrays of different types.
```
presto:default> SELECT array_except(ARRAY[5, 1, 7], ARRAY[7.0, 1.0, 3.0]);
_col0
-------
[5.0]
(1 row)
```
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