expression: NotNullFlag is not set correctly for some expression (#16954) #16995
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cherry-pick #16954 to release-4.0
What problem does this PR solve?
Problem Summary:
for some expression, the result type's NotNullFlag is not set correctly
What is changed and how it works?
Check and adjust type flag in
AggFieldTypeRelated changes
Check List
Tests
Side effects
Release note
case whenexpression