Simplify IsUnkown and IsNotUnkown expression
#6830
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Which issue does this PR close?
Related to #6345
Rationale for this change
Quoted from the PostgreSQL documentation:
So they can apply the same simplification rules.
What changes are included in this PR?
Simplify
IsUnkownandIsNotUnkownexpressionAre these changes tested?
Yes
Are there any user-facing changes?
No