Github user bersprockets commented on a diff in the pull request:
https://github.com/apache/spark/pull/21073#discussion_r193280073
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -308,6 +308,170 @@ case class MapEntries(child: Expression) extends
UnaryExpression with ExpectsInp
override def prettyName: String = "map_entries"
}
+/**
+ * Returns the union of all the given maps.
+ */
+@ExpressionDescription(
+usage = "_FUNC_(map, ...) - Returns the union of all the given maps",
--- End diff --
@ueshin
>We don't need to care about key duplication like CreateMap for now.
Just verifying: This means I should simply concatenate the maps, possibly
creating additional duplicates.
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