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3e49b8d051
Fixed structural compiler issue where some constructs such as MySQL / PostgreSQL "on conflict / on duplicate key" would rely upon the state of the :class:`_sql.Compiler` object being fixed against their statement as the top level statement, which would fail in cases where those statements are branched from a different context, such as a DDL construct linked to a SQL statement. Fixes: #5656 Change-Id: I568bf40adc7edcf72ea6c7fd6eb9d07790de189e