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A leaf tuple that we need to delete could get moved as a consequence of an insertion happening concurrently with the VACUUM scan. If it moves from a page past the current scan point to a page before, we'll miss it, which is not acceptable. Hence, when we see a leaf-page REDIRECT that could have been made since our scan started, chase down the redirection pointer much as if we were doing a normal index search, and be sure to vacuum every page it leads to. This fixes the issue because, if the tuple was on page N at the instant we start our scan, we will surely find it as a consequence of chasing the redirect from page N, no matter how much it moves around in between. Problem noted by Takashi Yamamoto.
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/.