Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/21011#discussion_r180317060
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -287,3 +288,173 @@ case class ArrayContains(left: Expression, right:
Expression)
override def prettyName: String = "array_contains"
}
+
+/**
+ * Creates a String containing all the elements of the input array
separated by the delimiter.
+ */
+@ExpressionDescription(
+ usage = """
+ _FUNC_(array, delimiter[, nullReplacement]) - Concatenates the
elements of the given array
+ using the delimiter and an optional string to replace nulls. If no
value is set for
+ nullReplacement, any null value is filtered.""",
+ examples = """
+ Examples:
+ > SELECT _FUNC_(array('hello', 'world'), ' ');
+ hello world
+ > SELECT _FUNC_(array('hello', null ,'world'), ' ');
+ hello world
+ > SELECT _FUNC_(array('hello', null ,'world'), ' ', ',');
+ hello , world
+ """)
--- End diff --
add `since`. see [this
discussion](https://github.com/apache/spark/pull/21021#discussion_r180309744).
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