Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21011#discussion_r181371786
--- 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
+ """, since = "2.4.0")
+case class ArrayJoin(
+ array: Expression,
+ delimiter: Expression,
+ nullReplacement: Option[Expression]) extends Expression with
ExpectsInputTypes {
+
+ def this(array: Expression, delimiter: Expression) = this(array,
delimiter, None)
+
+ def this(array: Expression, delimiter: Expression, nullReplacement:
Expression) =
+ this(array, delimiter, Some(nullReplacement))
+
+ override def inputTypes: Seq[AbstractDataType] = if
(nullReplacement.isDefined) {
+ Seq(ArrayType(StringType), StringType, StringType)
+ } else {
+ Seq(ArrayType(StringType), StringType)
+ }
--- End diff --
nit: indent?
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