Github user hvanhovell commented on the issue:
https://github.com/apache/spark/pull/13802
@maropu this won't work for other `hive_udf`s since these also maintain
internal state, and currently require per group processing. This also has a
greater potential of creating out-of-memory errors than the sort based approach.
I do think there is merit in the general ideal; but I think we should be
focussing on creating a growable bytes-to-bytes map and creating byte backed
mutable `ArrayData` and `MapData` implementations.
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