Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/20858#discussion_r175514291
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala
---
@@ -408,6 +408,7 @@ object FunctionRegistry {
expression[MapValues]("map_values"),
expression[Size]("size"),
expression[SortArray]("sort_array"),
+ expression[ConcatArrays]("concat_arrays"),
--- End diff --
Why not reusing `concat`?
concat(array1, array2, ..., arrayN) -> array ?
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