[WIP] refactor: framework for subquery decorrelation #16016
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FYI @irenjj |
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Which issue does this PR close?
Rationale for this change
What changes are included in this PR?
Purpose of this PR is to unify the optimizor for different subquery types (exists, scalar, in etc) as one of the step mentioned in #5492 but at the same time provide a skeleton to support more complex decorrelation logic
the PR is in draft state, and some existing decorrelation is not supported yet (pipeline breaker such as aggregation, window function ...)
Items to fix:
Are these changes tested?
Are there any user-facing changes?