Github user adrian-wang commented on a diff in the pull request:
https://github.com/apache/spark/pull/6775#discussion_r32702637
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -313,3 +312,78 @@ case class StringLength(child: Expression) extends
UnaryExpression with ExpectsI
defineCodeGen(ctx, ev, c => s"($c).length()")
}
}
+
+/**
+ * Like Concat below, but with custom separator SEP.
+ */
+case class ConcatWS(children: Expression*) extends Expression {
+ // return type is always String
+ override def dataType: DataType = StringType
+ override def nullable: Boolean = sep.nullable
+ override def foldable: Boolean = children.forall(_.foldable)
+ override def toString: String = s"""CONCAT_WS($children)"""
+ private def sep = children.head
+ private def exprs = children.tail
+
+ override def checkInputDataTypes(): TypeCheckResult = {
+ def supportedType(dt: DataType): Boolean = dt match {
+ case ArrayType(StringType, _) => true
--- End diff --
Yes, hive supports more than what's in the doc...
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