Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/1152#issuecomment-46941044
@mateiz I submitted a patch to core's Aggregator in #1191.
After implementing it in Aggregator, I realized it might be hard for Spark
SQL to reuse Aggregator unless we change Aggregator to allocate less temporary
objects (or write the aggregation code path in Spark SQL to output key value
tuples).
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