expression: fix the panic when we use unix_time ... (#17855)
#18002
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Signed-off-by: sre-bot <sre-bot@pingcap.com>
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winoros
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Jun 19, 2020
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unix_time expression in prepare and execute statement. (#17855)unix_time ... (#17855)
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cherry-pick #17855 to release-4.0
What problem does this PR solve?
Issue Number: close #17727
Problem Summary:
When we set
prepare-plan-cache = trueand useprepare && executestatement. Some time-related expression such asnow()will be wrapped intoconstant.deferredExprfor delayed calculation. But the expressionunix_timestampis special. When there is no parameter, it should be placed inconstant.deferredExprfor delay calculation. If there is a parameter, it should not be put intoconstant.deferredExpr, otherwise, it will cause access tonilpointerWhat is changed and how it works?
Special handling of the case of the expression
unix_timestampforfuncCallToExpression.Related changes
Check List
Tests
Release note
unix_timeexpression inprepare and executestatement.