Revert "Incorrectly merged AFTAggregator with zero total count" for branch-1.6#13630

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HyukjinKwon wants to merge 2 commits intoapache:branch-1.6from

HyukjinKwon:SPARK-15892-1.6

Commits on Jun 13, 2016

Change spark to sqlContext for 1.6
HyukjinKwon
committed

Commits on Jun 14, 2016

Revert "SPARK-15892: Incorrectly merged AFTAggregator with zero total count"
HyukjinKwon
committed