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JsonConstructorExpr can produce non-NULL output with a NULL input, so it should be treated as a non-strict construct. Failing to do so can lead to incorrect query behavior. For example, in the reported case, when pulling up a subquery that is under an outer join, if the subquery's target list contains a JsonConstructorExpr that uses subquery variables and it is mistakenly treated as strict, it will be pulled up without being wrapped in a PlaceHolderVar. As a result, the expression will be evaluated at the wrong place and will not be forced to null when the outer join should do so. Back-patch to v16 where JsonConstructorExpr was introduced. Bug: #19046 Reported-by: Runyuan He <runyuan@berkeley.edu> Author: Tender Wang <tndrwang@gmail.com> Co-authored-by: Richard Guo <guofenglinux@gmail.com> Discussion: https://postgr.es/m/19046-765b6602b0a8cfdf@postgresql.org Backpatch-through: 16 |
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| configure | ||
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| meson.build | ||
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| README | ||
| README.git | ||
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/.