Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/21103#discussion_r204218477
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -3805,3 +3799,332 @@ 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:Fun
+ > 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 {
+ override def dataType: DataType = ArrayType(elementType,
--- End diff --
I see. It makes sense.
I added a test for this into `DataFrameFunctionsSuite`.
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