b3358e2642
2005-05-13. When we find that a new inner tuple can't possibly match any outer tuple (because it contains a NULL), we can't immediately skip the tuple when we are in NEXTINNER state. Doing so can lead to emitting multiple copies of the tuple in FillInner mode, because we may rescan the tuple after returning to a previous marked tuple. Instead, proceed to NEXTOUTER state the same as we used to do. After we've found that there's no need to return to the marked position, we can go to SKIPINNER_ADVANCE state instead of SKIP_TEST when the inner tuple is unmatchable; this preserves the performance improvement. Per bug report from Bruce. I also made a couple of cosmetic code rearrangements and added a regression test for the problem.
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/c - Included in PostgreSQL core plPgsql - Included in PostgreSQL core - Similar to Oracle PL/sql plPerl - Included in PostgreSQL core plPHP - http://projects.commandprompt.com/projects/public/plphp plPython - Included in PostgreSQL core plJava - http://gborg.postgresql.org/project/pljava/projdisplay.php plTcl - Included in PostgreSQL core 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/.