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The MCV build should always call get_mincount_for_mcv_list(), as the there is no other logic to decide whether the MCV list represents all the data. So just remove the (ngroups > nitems) condition. Also, when building MCV lists, the number of items was limited by the statistics target (i.e. up to 10000). But when deserializing the MCV list, a different value (8192) was used to check the input, causing an error. Simply ensure that the same value is used in both places. This should have been included in 7300a69950, but I forgot to include it in that commit.
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/.