[SPARK-17177][SQL] Make grouping columns accessible from `RelationalGroupedDataset`#14742

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NarineK wants to merge 4 commits intoapache:masterfrom

NarineK:Make_columns_accessible_from_RelationalGroupedDataset

Commits on Jun 20, 2016

Fixed duplicated documentation problem + separated documentation for dapply and dapplyCollect
Narine Kokhlikyan
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Commits on Jul 21, 2016

merge with master
Narine Kokhlikyan
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Commits on Aug 21, 2016

Merge branch 'master' of https://github.com/apache/spark
Narine Kokhlikyan
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Initial commit
Narine Kokhlikyan
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