Hi My question is: Does PostgreSQL implements equivalence rules(from those are listed in email's attachment)? Which function or which part of source code(in PostgreSQL ) implements the equivalence rules? I think, this should be implemented in query optimization part of PostgreSQL, but which rule and where, I don't know? I want to use that(function or part of source code), to produce the equivalence Relational Algebras (based on equivalence rules in attachment) for a given SQL query(Relational Algebra).
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