expression: NotNullFlag is not set correctly for some expression (#16954)#16995

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sre-bot merged 2 commits intopingcap:release-4.0from sre-bot:release-4.0-079939f808a0

May 7, 2020

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Commits on May 6, 2020

expression: NotNullFlag is not set correctly for some expression (pingcap#16954 )

windtalker
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Commits on May 7, 2020

Merge branch 'release-4.0' into release-4.0-079939f808a0
sre-bot
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