[SPARK-11425] [SPARK-11486] Improve hybrid aggregation#9383

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davies wants to merge 15 commits intoapache:masterfrom

davies:fix_switch

Commits on Oct 30, 2015

Do hash-based aggregation for all records before switch to sort-based
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merge the last map
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Commits on Nov 2, 2015

update tests
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fix bug
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Commits on Nov 3, 2015

address comments, add regression test
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Commits on Nov 4, 2015

free the array after spilling
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refactor
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cleanup
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throw better exception
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add more comments
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Merge branch 'master' of github.com:apache/spark into fix_switch
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fix conflict
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Update UnsafeFixedWidthAggregationMap.java
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fix build
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Commits on Nov 5, 2015

fix test
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