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[feature](nereids)support 'isNull' expression - #14967
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hello-stephen
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morrySnow
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Jun 4, 2026
### What problem does this PR solve? related PR apache#14967apache#15163 Problem Summary: The following SQL should have been executable, but it resulted in an unexpected error. ```sql select * from t where isNull(c1) = 1; ``` the error message is ``` Can not found function 'isNull' ```
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Proposed changes
let nereids support sql like:
select * from t where isnull(k1)Issue Number: close #xxx
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