[SPARK-15980] [SQL] Support Stata-like tabulation of values in a single column, optionally with weights#13614

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shafiquejamal wants to merge 4 commits intoapache:masterfrom

shafiquejamal:crosstab

Commits on Jun 10, 2016

Support Stata-like tabulation of values in a single column, optionally with weights
shafiquejamal
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Commits on Jun 11, 2016

Commits on Jun 13, 2016

Perform sum and count using aggregate method, rather than after collect
shafiquejamal
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