expression: return an error when finding some expressions cannot be pushed down to avoid panic (#16671) #16869
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…ushed down to avoid panic (pingcap#16671)
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cherry-pick #16671 to release-4.0
What problem does this PR solve?
Issue Number: the first step to fix #16597
Problem Summary: in #16597, TiDB tries to convert some expressions which cannot be pushed down to
PBdata, which causes a panic.And we don't know which expression causes this problem.
What is changed and how it works?
When converting expressions to
PBdata, if it finds some expression cannot be pushed down, return an error with information of that expression.