Method rewrite_expr

src/sql/src/plan/transform_ast.rs:449–476

(&mut self, expr: &Expr<Aug>)

    }

    fn rewrite_expr(&mut self, expr: &Expr<Aug>) -> Option<(Ident, Expr<Aug>)> {
        match expr {
            Expr::Function(function) => self.rewrite_function(function),
            // Rewrites special keywords that SQL considers to be function calls
            // to actual function calls. For example, `SELECT current_timestamp`
            // is rewritten to `SELECT current_timestamp()`.
            Expr::Identifier(ident) if ident.len() == 1 => {
                let ident = normalize::ident(ident[0].clone());
                let fn_ident = match ident.as_str() {
                    "current_role" => Some("current_user"),
                    "current_schema" | "current_timestamp" | "current_user" | "session_user"
                    | "current_catalog" => Some(ident.as_str()),
                    _ => None,
                };
                match fn_ident {
                    None => None,
                    Some(fn_ident) => {
                        let expr = Expr::call_nullary(
                            self.scx
                                .dangerous_resolve_name(vec![PG_CATALOG_SCHEMA, fn_ident]),
                        );
                        Some((Ident::new_unchecked(ident), expr))
                    }
                }
            }
            _ => None,
        }
    }
}

impl<'ast> VisitMut<'ast, Aug> for FuncRewriter<'_> {