Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/13967#discussion_r68931609
--- 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.")
+case class MapValues(child: Expression)
+ extends UnaryExpression with ExpectsInputTypes {
+
+ override def inputTypes: Seq[AbstractDataType] = Seq(MapType)
+
+ override def dataType: DataType =
ArrayType(child.dataType.asInstanceOf[MapType].valueType)
+
+ override def foldable: Boolean = child.foldable
+
+ override def nullSafeEval(map: Any): Any = {
+ map.asInstanceOf[MapData].valueArray().copy()
--- End diff --
What if we don't call `copy` here? It looks reasonable to copy, I'm just
curious :)
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