[SPARK-8968] [SQL] external sort by the partition clomns when dynamic partitioning to optimize the memory overhead#7336

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scwf wants to merge 6 commits intoapache:masterfrom

scwf:dynamic-optimize-basedon-apachespark

Commits on Jan 9, 2016

hive side: fallback on sorting when writing many dynamic partitions

scwf
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王飞
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fix spark-3810 test failure

scwf
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王飞
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Commits on Jan 10, 2016

always do sort based dynamic patition writing
scwf
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Commits on Jan 20, 2016