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transformJsonArrayQueryConstructor() applied transformStmt() to the same subquery tree twice. While this causes no issue in many cases, there are some where it causes a coredump, thanks to the parser's habit of scribbling on its input. Fix by making a copy before the first transformation (compare0f43083d1). This is quite brute-force, but then so is the whole business of transforming the input twice. Per discussion in the bug thread, this implementation of json_array() parsing should be replaced completely. But that will take some work and will surely not be back-patchable, so for the moment let's take the easy way out. Oversight in7081ac46a. Back-patch to v16 where that came in. Bug: #18877 Reported-by: Yu Liang <luy70@psu.edu> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/18877-c3c3ad75845833bb@postgresql.org Backpatch-through: 16
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/.