Github user kiszk commented on a diff in the pull request: https://github.com/apache/spark/pull/21103#discussion_r205674364 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala --- @@ -3805,3 +3799,233 @@ object ArrayUnion { new GenericArrayData(arrayBuffer) } } + +/** + * Returns an array of the elements in the intersect of x and y, without duplicates + */ +@ExpressionDescription( + usage = """ + _FUNC_(array1, array2) - Returns an array of the elements in array1 but not in array2, + without duplicates. + """, + examples = """ + Examples: + > SELECT _FUNC_(array(1, 2, 3), array(1, 3, 5)); + array(2) + """, + since = "2.4.0") +case class ArrayExcept(left: Expression, right: Expression) extends ArraySetLike { --- End diff -- The check at `dataType` in `ComplexTypeMergingExpression` should be useful. Based on [the discussion](https://github.com/apache/spark/pull/21103#discussion_r203746577), the result of `dataType should be only `left.dataType`. Will we use only the checks?
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