[SPARK-8160][SPARK-9240][SQL]Support hybrid aggregate using external sorting when memory is not enough #7827
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Test build #39214 has finished for PR 7827 at commit
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@lianhuiwang I'm creating a sequence of new pull requests based on ideas from your patch here. |
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Hey @lianhuiwang, I think that this patch has been subsumed by #7813 and the other subtasks linked against https://issues.apache.org/jira/browse/SPARK-8160, so do you mind closing this PR? Thanks! |
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according to UnsafeFixedWidthAggregationMap, this PR implement external aggregation when each task has no enough memory. firstly when memory is not enough it spills BytesToBytesMap to disk. when inserting is finished, merge in-memory map and disk's spill files and return final aggregation value of each key.