Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/21102#discussion_r223460909
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -3965,6 +4034,248 @@ object ArrayUnion {
}
}
+/**
+ * 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 the
intersection of array1 and
+ array2, without duplicates.
--- End diff --
It sounds like our null handling is incorrect. NULL does not equal to NULL.
```
SELECT array_intersect(ARRAY(NULL), ARRAY(NULL));
```
This should return an empty set.
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