febc9a613c
for boolean indexes. Previously we would only use such an index with WHERE clauses like 'indexkey = true' or 'indexkey = false'. The new code transforms the cases 'indexkey', 'NOT indexkey', 'indexkey IS TRUE', and 'indexkey IS FALSE' into one of these. While this is only marginally useful in itself, I intend soon to change constant-expression simplification so that 'foo = true' and 'foo = false' are reduced to just 'foo' and 'NOT foo' ... which would lose the ability to use boolean indexes for such queries at all, if the indexscan machinery couldn't make the reverse transformation.
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/.