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Since their introduction, partition trees have been a bit lossy regarding temporary relations. Inheritance trees respect the following patterns: 1) a child relation can be temporary if the parent is permanent. 2) a child relation can be temporary if the parent is temporary. 3) a child relation cannot be permanent if the parent is temporary. 4) The use of temporary relations also imply that when both parent and child need to be from the same sessions. Partitions share many similar patterns with inheritance, however the handling of the partition bounds make the situation a bit tricky for case 1) as the partition code bases a lot of its lookup code upon PartitionDesc which does not really look after relpersistence. This causes for example a temporary partition created by session A to be visible by another session B, preventing this session B to create an extra partition which overlaps with the temporary one created by A with a non-intuitive error message. There could be use-cases where mixing permanent partitioned tables with temporary partitions make sense, but that would be a new feature. Partitions respect 2), 3) and 4) already. It is a bit depressing to see those error checks happening in MergeAttributes() whose purpose is different, but that's left as future refactoring work. Back-patch down to 10, which is where partitioning has been introduced, except that default partitions do not apply there. Documentation also includes limitations related to the use of temporary tables with partition trees. Reported-by: David Rowley Author: Amit Langote, Michael Paquier Reviewed-by: Ashutosh Bapat, Amit Langote, Michael Paquier Discussion: https://postgr.es/m/CAKJS1f94Ojk0og9GMkRHGt8wHTW=ijq5KzJKuoBoqWLwSVwGmw@mail.gmail.com |
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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/.