c50b3158bf
Commit ea4e1c0e8f resolved issues with memory alignment in serialized pg_mcv_list values, but it required copying data to/from the varlena buffer during serialization and deserialization. As the MCV lits may be fairly large, the overhead (memory consumption, CPU usage) can get rather significant too. This change tweaks the serialization format so that the alignment is correct with respect to the varlena value, and so the parts may be accessed directly without copying the data. Catversion bump, as it affects existing pg_statistic_ext data.
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/.