652686a334
When estimating the selectivity of "range_var <@ range_constant" or "range_var @> range_constant", if the upper (or respectively lower) bound of the range_constant was above the last bin of the range_var's histogram, the code would access uninitialized memory and potentially crash (though it seems the probability of a crash is quite low). Handle the endpoint cases explicitly to fix that. While at it, be more paranoid about the possibility of getting NaN or other silly results from the range type's subdiff function. And improve some comments. Ordinarily we'd probably add a regression test case demonstrating the bug in unpatched code. But it's too hard to get it to crash reliably because of the uninitialized-memory dependence, so skip that. Per bug #16122 from Adam Scott. It's been broken from the beginning, apparently, so backpatch to all supported branches. Diagnosis by Michael Paquier, patch by Andrey Borodin and Tom Lane. Discussion: https://postgr.es/m/16122-eb35bc248c806c15@postgresql.org |
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| README.git | ||
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README
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/.