expression: return an error when finding some expressions cannot be pushed down to avoid panic (#16671)#16869

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SunRunAway merged 1 commit intopingcap:release-4.0from sre-bot:release-4.0-f51c2001bf74

Apr 27, 2020

+73-36

Commits on Apr 27, 2020

expression: return an error when finding some expressions cannot be pushed down to avoid panic (pingcap#16671 )

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