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heapgettup_advance_block() (or heapgettup() and heapgettup_pagemode() in versions before v16) would incorrectly decrement rs_numblocks when advancing to the next block. Ordinarily this was fine, but if the TID Range scan plan was used by a scrollable cursor and the cursor was fetched backwards enough to result in another block being required, then rs_numblocks may have reached 0 prematurely resulting in the scan ending prematurely. Reported-by: Jeff Davis <pgsql@j-davis.com> Author: Ewan Young <kdbase.hack@gmail.com> Discussion: https://postgr.es/m/6b50233fcc0f7d6f4845f083777fa9702d9612e4.camel@j-davis.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/.