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In nodeWindowAgg.c, the calculations for frame start and end positions in ROWS and GROUPS modes were performed using simple integer addition. If a user-supplied offset was sufficiently large (close to INT64_MAX), adding it to the current row or group index could cause a signed integer overflow, wrapping the result to a negative number. This led to incorrect behavior where frame boundaries that should have extended indefinitely (or beyond the partition end) were treated as falling at the first row, or where valid rows were incorrectly marked as out-of-frame. Depending on the specific query and data, these overflows can result in incorrect query results, execution errors, or assertion failures. To fix, use overflow-aware integer addition (ie, pg_add_s64_overflow) to check for overflows during these additions. If an overflow is detected, the boundary is now clamped to INT64_MAX. This ensures the logic correctly treats the boundary as extending to the end of the partition. Bug: #19405 Reported-by: Alexander Lakhin <exclusion@gmail.com> Author: Richard Guo <guofenglinux@gmail.com> Reviewed-by: Tender Wang <tndrwang@gmail.com> Discussion: https://postgr.es/m/19405-1ecf025dda171555@postgresql.org Backpatch-through: 14 |
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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/.