b0f18cb77f
In preparation for adding write-ahead logging to hash indexes, refactor _hash_freeovflpage and _hash_squeezebucket so that all related page modifications happen in a single section of code. The previous coding assumed that it would be fine to move tuples one at a time, and also that the various operations involved in freeing an overflow page didn't necessarily all need to be done together, all of which is true if you don't care about write-ahead logging. Amit Kapila, with slight changes by me.
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. 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/.