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The built-in OSAs all share the same transition function, so they can share transition state as long as the final functions cooperate to not do the sort step more than once. To avoid running the tuplesort object in randomAccess mode unnecessarily, add a bit of infrastructure to nodeAgg.c to let the aggregate functions find out whether the transition state is actually being shared or not. This doesn't work for the hypothetical aggregates, since those inject a hypothetical row that isn't traceable to the shared input state. So they remain marked aggfinalmodify = 'w'. Discussion: https://postgr.es/m/CAB4ELO5RZhOamuT9Xsf72ozbenDLLXZKSk07FiSVsuJNZB861A@mail.gmail.com
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/.