Github user mn-mikke commented on a diff in the pull request: https://github.com/apache/spark/pull/20858#discussion_r176841337 --- 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 -- Ok, will merge the functions into one. Do you find having one expression class concatenation per the concatenation type ok? I'm afraid if I incorporate all the logic into one expression class then the code will become messy since each codeGen and eveluation has a different nature.
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