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8c53d7f024
This PR fixes bugs found in the [turso- go](https://github.com/tursodatabase/turso-go) driver with UPSERT clause earlier, where `Gorm` will (obviously) use Expr::Variable's as well as use quotes for `Expr::Qualified` in the tail end of an UPSERT statement. Example: ```sql INSERT INTO users (a,b,c) VALUES (?,?,?) ON CONFLICT (`users`.`a`) DO UPDATE SET b = `excluded`.`b`, a = ?; ``` and previously we were not properly calling `rewrite_expr`, which was not properly setting the anonymous `Expr::Variable` to `__param_N` named parameter, so it would ignore it completely, then return the wrong # of parameters. Also, we didn't handle quoted "`excluded`.`x`", so it would panic in the optimizer that Qualified should have been rewritten earlier. Closes #3157