[SPARK-12740] [SPARK-13932] support grouping()/grouping_id() in having/order clause#12235

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davies:grouping_having

Commits on Apr 7, 2016

support grouping()/grouping_id() in having clause
Davies Liu
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support grouping() in sort
Davies Liu
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update comments
Davies Liu
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add a test for having
Davies Liu
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CR
Davies Liu
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