stats: fix estimation for time equal conditions (#11511)#11512

Merged

zz-jason merged 7 commits intopingcap:release-3.0from sre-bot:release-3.0-b17848b8805b

Aug 1, 2019

+50-29

Commits on Jul 29, 2019

stats: fix estimation for time equal conditions

alivxxx
authored and
root
committed

Commits on Jul 30, 2019

Update cmsketch.go
alivxxx
authored