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CLUSTER sort won't use the datum1 SortTuple field when clustering against an index whose leading key is an expression. This makes it unsafe to use the abbreviated keys optimization, which was missed by the logic that sets up SortSupport state. Affected tuplesorts output tuples in a completely bogus order as a result (the wrong SortSupport based comparator was used for the leading attribute). This issue is similar to the bug fixed on the master branch by recent commit |
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README.git |
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/.