cloud-fan commented on a change in pull request #35671:
URL: https://github.com/apache/spark/pull/35671#discussion_r817402188
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
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@@ -133,6 +133,34 @@ object Size {
def apply(child: Expression): Size = new Size(child)
}
+
+/**
+ * Given an array, returns total number of elements in it.
+ */
+@ExpressionDescription(
+ usage = """
+ _FUNC_(expr) - Returns the size of an array. The function returns null for
null input.
+ """,
+ examples = """
+ Examples:
+ > SELECT _FUNC_(array('b', 'd', 'c', 'a'));
+ 4
+ """,
+ since = "3.3.0",
+ group = "collection_funcs")
+case class ArraySize(expr: Expression) extends RuntimeReplaceable with
ImplicitCastInputTypes {
Review comment:
nit: `with UnaryLike[Expression]` so that we don't need to implement
`def children`
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