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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