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In nested sub-regex trees, lower-level nodes created DFAs and then destroyed them again before exiting, which is a bit dumb considering that the recursive search is likely to call those nodes again later. Instead cache each created DFA until the end of pg_regexec(). This is basically a space for time tradeoff, in that it might increase the maximum memory usage. However, in most regex patterns there are not all that many subre nodes, so not that many DFAs --- and in any case, the peak usage occurs when reaching the bottom recursion level, and except for alternation cases that's going to be the same anyway. |
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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/.