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714780dcdd
nbtree's mark/restore processing failed to correctly handle an edge case involving array key advancement and related search-type scan key state. Scans with ScalarArrayScalarArrayOpExpr quals requiring mark/restore processing (for a merge join) could incorrectly conclude that an affected array/scan key must not have advanced during the time between marking and restoring the scan's position. As a result of all this, array key handling within btrestrpos could skip a required call to _bt_preprocess_keys(). This confusion allowed later primitive index scans to overlook tuples matching the true current array keys. The scan's search-type scan keys would still have spurious values corresponding to the final array element(s) -- not values matching the first/now-current array element(s). To fix, remember that "array key wraparound" has taken place during the ongoing btrescan in a flag variable stored in the scan's state, and use that information at the point where btrestrpos decides if another call to _bt_preprocess_keys is required. Oversight in commit |
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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/.