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memory in the executor's per-query memory context. It also inefficient: it invokes get_call_result_type() and TupleDescGetAttInMetadata() for every call to return_next, rather than invoking them once (per PL/Perl function call) and memoizing the result. This patch makes the following changes: - refactor the code to include all the "per PL/Perl function call" data inside a single struct, "current_call_data". This means we don't need to save and restore N pointers for every recursive call into PL/Perl, we can just save and restore one. - lookup the return type metadata needed by plperl_return_next() once, and then stash it in "current_call_data", so as to avoid doing the lookup for every call to return_next. - create a temporary memory context in which to evaluate the return type's input functions. This memory context is reset for each call to return_next. The patch appears to fix the memory leak, and substantially reduces the overhead imposed by return_next. |
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| contrib | ||
| doc | ||
| src | ||
| aclocal.m4 | ||
| configure | ||
| configure.in | ||
| COPYRIGHT | ||
| GNUmakefile.in | ||
| Makefile | ||
| README | ||
| README.CVS | ||
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. The JDBC, ODBC, C++, Python, and Tcl interfaces have been moved to the PostgreSQL Projects Web Site at http://gborg.postgresql.org for separate maintenance. A Perl DBI/DBD driver is available from CPAN. 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 ftp://ftp.postgresql.org/pub/. For more information look at our web site located at http://www.postgresql.org/.