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if either of the input relations can legally be joined to any other rels using join clauses. This avoids uselessly (and expensively) considering a lot of really stupid join paths when there is a join restriction with a large footprint, that is, lots of relations inside its LHS or RHS. My patch of 15-Feb-2007 had been causing the code to consider joining *every* combination of rels inside such a group, which is exponentially bad :-(. With this behavior, clauseless bushy joins will be done if necessary, but they'll be put off as long as possible. Per report from Jakub Ouhrabka. Backpatch to 8.2. We might someday want to backpatch to 8.1 as well, but 8.1 does not have the problem for OUTER JOIN nests, only for IN-clauses, so it's not clear anyone's very likely to hit it in practice; and the current patch doesn't apply cleanly to 8.1. |
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| COPYRIGHT | ||
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| README | ||
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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 including some of the more common listed below: C++ - http://thaiopensource.org/development/libpqxx/ JDBC - http://jdbc.postgresql.org ODBC - http://odbc.postgresql.org Perl - http://search.cpan.org/~dbdpg/ PHP - http://www.php.net Python - http://www.initd.org/ Ruby - http://ruby.scripting.ca/postgres/ Other language binding are available from a variety of contributing parties. PostgreSQL also has a great number of procedural languages available, a short but not complete list is below: PL/pgSQL - included in PostgreSQL source distribution PL/Perl - included in PostgreSQL source distribution PL/PHP - http://projects.commandprompt.com/projects/public/plphp PL/Python - included in PostgreSQL source distribution PL/Java - http://gborg.postgresql.org/project/pljava/projdisplay.php PL/Tcl - included in PostgreSQL source distribution 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/.