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Base de données relationnelle
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The expression (len_diff * 10 * (an + 1)) used as the return value of ltree_compare() is computed at int32 width. With LTREE_MAX_LEVELS = 65535, the product can exceed INT32_MAX once an ltree has more than ~14,653 levels, which causes the result to wrap and invert its sign. That corrupts btree ordering as well as the "magnitude" consumed by ltree_penalty() for GiST page splits. To fix, split ltree_compare() into two functions. The new ltree_compare_distance() function returns a float, which won't overflow. It's used by the ltree_penalty() caller. All the other callers only care about the sign of the return value, i.e. which of the arguments is greater, so change ltree_compare() to not multiply the result with (10 * (an + 1)), which avoids the overflow for those callers. Existing btree or GiST indexes on ltree columns containing values with more than ~14,653 levels may be corrupt and should be REINDEXed. Add a regression test based on the reporter's PoC. Author: Ayush Tiwari <ayushtiwari.slg01@gmail.com> Reported-by: 王跃林 <violin0613@tju.edu.cn> Discussion: https://www.postgresql.org/message-id/AI6AnABgKW93Qbx1jVzi84r9.8.1781322625756.Hmail.3020001251%40tju.edu.cn 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/.