Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/21031#discussion_r181340756
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -3282,6 +3282,14 @@ object functions {
*/
def size(e: Column): Column = withExpr { Size(e.expr) }
+ /**
+ * Returns length of array or map as BigInt.
--- End diff --
BigInt -> long
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