Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/13967#discussion_r69084590
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -44,6 +44,56 @@ case class Size(child: Expression) extends
UnaryExpression with ExpectsInputType
}
/**
+ * Returns an unordered array containing the keys of the map.
+ */
+@ExpressionDescription(
+ usage = "_FUNC_(map) - Returns an unordered array containing the keys of
the map.")
+case class MapKeys(child: Expression)
+ extends UnaryExpression with ExpectsInputTypes {
+
+ override def inputTypes: Seq[AbstractDataType] = Seq(MapType)
+
+ override def dataType: DataType =
ArrayType(child.dataType.asInstanceOf[MapType].keyType)
+
+ override def foldable: Boolean = child.foldable
+
+ override def nullSafeEval(map: Any): Any = {
+ map.asInstanceOf[MapData].keyArray().copy()
+ }
+
+ override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
+ nullSafeCodeGen(ctx, ev, c => s"${ev.value} = ($c).keyArray().copy();")
+ }
+
+ override def prettyName: String = "map_keys"
+}
+
+/**
+ * Returns an unordered array containing the values of the map.
+ */
+@ExpressionDescription(
+ usage = "_FUNC_(map) - Returns an unordered array containing the values
of the map.")
--- End diff --
example would be great.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For additional commands, e-mail: reviews-h...@spark.apache.org
