Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/20858#discussion_r176971799
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -287,3 +289,152 @@ case class ArrayContains(left: Expression, right:
Expression)
override def prettyName: String = "array_contains"
}
+
+/**
+ * Concatenates multiple arrays into one.
+ */
+@ExpressionDescription(
+ usage = "_FUNC_(expr, ...) - Concatenates multiple arrays into one.",
+ examples = """
+ Examples:
+ > SELECT _FUNC_(array(1, 2, 3), array(4, 5), array(6));
+ [1,2,3,4,5,6]
+ """)
+case class ConcatArrays(children: Seq[Expression]) extends Expression with
NullSafeEvaluation {
--- End diff --
Can we add a common base class (e.g., `ConcatLike`) for handling nested
`ConcatArrays` in the optimizer(`CombineConcat`)?
https://github.com/apache/spark/blob/e4bec7cb88b9ee63f8497e3f9e0ab0bfa5d5a77c/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala#L649
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