Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/20858#discussion_r176966017
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -3046,6 +3046,14 @@ object functions {
ArrayContains(column.expr, Literal(value))
}
+ /**
+ * Merges multiple arrays into one by putting elements from the specific
array after elements
+ * from the previous array. If any of the arrays is null, null is
returned.
+ * @group collection_funcs
+ * @since 2.4.0
+ */
+ def concat_arrays(columns: Column*): Column = withExpr {
ConcatArrays(columns.map(_.expr)) }
--- End diff --
We need to add this func. in `sql/functions` here? It seems we might
recommend users to use these kinds of functions via `selectExpr`, so is it okay
to add this only in `FunctionRegistry`? Thoughts? @viirya @gatorsmile
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