Github user lianhuiwang commented on the pull request:
https://github.com/apache/spark/pull/6875#issuecomment-117548581
@davies yes,i get it. at first, i think we can have a flag to do sort based
aggregation on reduce stage that replace with hash based aggregation. and then
based on memory of a task we can determine hash based aggregation or sort based
aggregation and automatically set this flag.
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