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When marking a branch as half-dead, a pointer to the top of the branch is stored in the leaf block's hi-key. During normal operation, the high key was left in place, and the block number was just stored in the ctid field of the high key tuple, but in WAL replay, the high key was recreated as a truncated tuple with zero columns. For the sake of easier debugging, also truncate the tuple in normal operation, so that the page is identical after WAL replay. Also, rename the 'downlink' field in the WAL record to 'topparent', as that seems like a more descriptive name. And make sure it's set to invalid when unlinking the leaf page.
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/.