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statistics: change the dnv of default null column to 0 #4825

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merged 3 commits into from Oct 19, 2017

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hanfei1991 commented Oct 19, 2017

fix #4820
null count shouldn't be counted into ndv.

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/run-all-tests

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hanfei1991 commented Oct 19, 2017

/run-all-tests

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LGTM

@hanfei1991 hanfei1991 merged commit e035f66 into pingcap:master Oct 19, 2017

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@hanfei1991 hanfei1991 deleted the hanfei1991:hanfei/null branch Oct 19, 2017

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