fb95cc72bf
Partition pruning wrongly assumed that, for a table partitioned on a boolean column, a clause in the form "boolcol IS NOT false" and "boolcol IS NOT true" could be inverted to correspondingly become "boolcol IS true" and "boolcol IS false". These are not equivalent as the NOT version matches the opposite boolean value *and* NULLs. This incorrect assumption meant that partition pruning pruned away partitions that could contain NULL values. Here we fix this by correctly not pruning partitions which could store NULLs. To be affected by this, the table must be partitioned by a NULLable boolean column and queries would have to contain "boolcol IS NOT false" or "boolcol IS NOT true". This could result in queries filtering out NULL values with a LIST partitioned table and "ERROR: invalid strategy number 0" for RANGE and HASH partitioned tables. Reported-by: Alexander Lakhin Bug: #18344 Discussion: https://postgr.es/m/18344-8d3f00bada6d09c6@postgresql.org Backpatch-through: 12 |
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| HISTORY | ||
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| README | ||
| README.git | ||
| aclocal.m4 | ||
| configure | ||
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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/.