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isSimpleNode() and related code treated every XmlExpr as self-delimiting. Most of them are, because they look like function calls with some extra decoration. But "x IS DOCUMENT" is not: it is a postfix test, like IS NULL. Printed as the operand of another operator, or as the operand of a postfix test, it was therefore not parenthesized and could not be parsed back, or was parsed as something unintended. Under-parenthesization occurred even in non-pretty-print cases, so that this could break dump/restore workflows. To fix, treat IS DOCUMENT as neither simple nor function-like, and give it the same treatment as other postfix tests. Also pass the single argument of IS DOCUMENT, not the argument list, to get_rule_expr_paren(). This avoids unnecessary parenthesization of the argument. Author: Henson Choi <assam258@gmail.com> Reviewed-by: Prashant Chinnam <crprashant@hotmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CAAAe_zDuPSkc8ihCctV67Lxbqock+S4wqCHHo8xxZ1t4teXo0g@mail.gmail.com Backpatch-through: 14
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. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.