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The previous coding relied (without any documentation) on the data[] member of HashMemoryChunkData being at a MAXALIGN'ed offset. If it was not, the tuples would not be maxaligned either, leading to failures on alignment-picky machines. While there seems to be no live bug on any platform we support, this is clearly pretty fragile: any addition to or rearrangement of the fields in HashMemoryChunkData could break it. Let's remove the hazard by getting rid of the data[] member and instead using pointer arithmetic with an explicitly maxalign'ed offset. Discussion: https://postgr.es/m/14483.1514938129@sss.pgh.pa.us
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/.