planner: fix group by resolver for multi items with param marker (#16363)#16377

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sre-bot merged 2 commits intopingcap:release-4.0from sre-bot:release-4.0-85efba06ec91

Apr 15, 2020

+33

Commits on Apr 14, 2020

planner: fix group by resolver for multi items with param mark… (pingcap#16363 )

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Commits on Apr 15, 2020

Merge branch 'release-4.0' into release-4.0-85efba06ec91
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