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[SPARK-19509][SQL]Fix a NPE problem in grouping sets when using an empty column#16874

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stanzhai wants to merge 1 commit intoapache:branch-2.1from
stanzhai:fix-grouping-sets
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[SPARK-19509][SQL]Fix a NPE problem in grouping sets when using an empty column#16874
stanzhai wants to merge 1 commit intoapache:branch-2.1from
stanzhai:fix-grouping-sets

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Commits on Feb 9, 2017