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Previously, copy_plpgsql_datum did a separate palloc for each variable needing instance-local storage. In simple benchmarks this made for a noticeable fraction of the total runtime. Improve it by precalculating the space needed for all of a function's variables and doing just one palloc for all of them. In passing, remove PLPGSQL_DTYPE_EXPR from the list of plpgsql "datum" types, since in fact it has nothing in common with the others, and there is noplace that needs to discriminate on the basis of dtype between an expression and any type of datum. And add comments clarifying which datum struct fields are generic and which aren't. Tom Lane, reviewed by Pavel Stehule Discussion: https://postgr.es/m/11986.1514407114@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/.