[SPARK-8861][SQL]Add accumulators to SparkPlan operations#7590

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feynmanliang wants to merge 8 commits intoapache:masterfrom

feynmanliang:SPARK-8856-SparkPlan-instrumentation

Commits on Jul 22, 2015

Add accumulators to SparkPlan and initial impls
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Make accumulators map only instantiate once
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Make accumulators doc more accurate
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Move internal accumulator into a private SparkContext method
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Transform instead of drain iterator
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Commits on Jul 28, 2015

Merge remote-tracking branch 'apache/master' into SPARK-8856-SparkPlan-instrumentation
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Fix failing tests
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Remove println
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