[SPARK-12063][SQL] Use number in group by clause to refer to columns#10052

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dereksabryfb wants to merge 7 commits intoapache:masterfrom

dereksabryfb:group_by_number

Commits on Dec 1, 2015

Use number to refer to columns in group by clause
Derek Sabry
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Commits on Dec 3, 2015

Group by Column Number for Spark SQL
Derek Sabry
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Commits on Dec 7, 2015

minor style change
Derek Sabry
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Commits on Dec 10, 2015

Add Sort() case
Derek Sabry
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scala style
dereksabryfb
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Commits on Dec 11, 2015