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The TableFunc node (i.e., XMLTABLE) includes type and collation OIDs that might not be referenced anywhere else in the expression tree, so they need to be accounted for when extracting dependencies. Fortunately, the practical effects of this are limited, since (a) it's somewhat unlikely that people would be extracting columns of non-builtin types from an XML document, and (b) in many scenarios, the query would contain other references to such types, or functions depending on them. However, it's not hard to construct examples wherein the existing code lets one drop a type used in XMLTABLE and thereby break a view. This is evidently an original oversight in the XMLTABLE patch, so back-patch to v10 where that came in. Discussion: https://postgr.es/m/18427.1573508501@sss.pgh.pa.us
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/.