Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/21103#discussion_r205928966 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala --- @@ -3968,3 +3964,317 @@ 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 + with ComplexTypeMergingExpression { + override def dataType: DataType = { + dataTypeCheck --- End diff -- My motivation is to let these array functions to go through the type coercion rules for `ComplexTypeMergingExpression`. This check is like `assert` and I don't need we need it if we override `dataType`
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