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There were multiple issues in deserialization of pg_mcv_list values. Firstly, the data is loaded from syscache, but the deserialization was performed after ReleaseSysCache(), at which point the data might have already disappeared. Fixed by moving the calls in statext_mcv_load, and using the same NULL-handling code as existing stats. Secondly, the deserialized representation used pointers into the serialized representation. But that is also unsafe, because the data may disappear at any time. Fixed by reworking and simplifying the deserialization code to always copy all the data. And thirdly, when deserializing values for types passed by value, the code simply did memcpy(d,s,typlen) which however does not work on bigendian machines. Fixed by using fetch_att/store_att_byval.
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/.