Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/20938#discussion_r179970092
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -3300,6 +3300,14 @@ object functions {
*/
def sort_array(e: Column, asc: Boolean): Column = withExpr {
SortArray(e.expr, lit(asc).expr) }
+ /**
+ * Creates a single array from an array of arrays. If a structure of
nested arrays is deeper than
+ * two levels, only one level of nesting is removed.
+ * @group collection_funcs
+ * @since 2.4.0
+ */
+ def flatten(e: Column): Column = withExpr{ Flatten(e.expr) }
--- End diff --
`r{` -> `r {`
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