[SPARK-11275] [SQL] Incorrect results when using rollup/cube#9815

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aray wants to merge 2 commits intoapache:masterfrom

aray:groupingset-agg-fix

Commits on Nov 18, 2015

Fixes bug with grouping sets (including cube/rollup) where aggregates that included grouping expressions would return the wrong (null) result.
aray
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Commits on Nov 19, 2015

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aray
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