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We used to mimic the way a stack is constructed when descending the tree during normal GiST inserts, but that was quite complicated during a buffered build. It was also wrong: in GiST, the left-to-right relationships on different levels might not match each other, so that when you know the parent of a child page, you won't necessarily find the parent of the page to the right of the child page by following the rightlinks at the parent level. This sometimes led to "could not re-find parent" errors while building a GiST index. We now use a simple hash table to track the parent of every internal page. Whenever a page is split, and downlinks are moved from one page to another, we update the hash table accordingly. This is also better for performance than the old method, as we never need to move right to re-find the parent page, which could take a significant amount of time for buffers that were created much earlier in the index build.
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. 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/.