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In the transition functions, we don't really need to recheck this after the first call. I had been feeling paranoid about possibly getting a non-null argument value in some other context; but it's probably game over anyway if we have a non-null "internal" value that's not what we are expecting. In the final functions, the general convention in pre-existing final functions seems to be that an Assert() is good enough, so do it like that here too. This seems to save a few tenths of a percent of overall query runtime, which isn't much, but still it's just overhead if there's not a plausible case where the checks would fire. |
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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: http://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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.