[SPARK-6466][SQL] Remove unnecessary attributes when resolving GroupingSets#5134

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viirya wants to merge 4 commits intoapache:masterfrom

viirya:remove_attr_expand

Commits on Mar 23, 2015

Only keep necessary attribute output.
viirya
committed

Commits on Mar 24, 2015

Move it to Optimizer.
viirya
committed

Commits on Apr 28, 2015