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In match_unique_clauses(), use equal() to compare complete restriction clauses after substituting the relation ID, instead of comparing their operands separately. This ensures that the operator and input collation also match, preventing incorrect self-join elimination when restrictions have identical operands but different semantics. The former code apparently intended to support matching clauses to commuted versions of those clauses, but the amount of complication that added seems far out of proportion to the value, so just drop that goal. (If we wanted to reinstate it, something based on applying CommuteOpExpr or equivalent logic would be better.) Author: Tender Wang <tndrwang@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CAHewXNmwYrp0DTuisCyfXXjVa_irUdDFApUzLVDg3J4MAR6gEg@mail.gmail.com Backpatch-through: 18
PostgreSQL Database Management System
This directory contains the source code distribution of the PostgreSQL database management system.
PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.
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