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Previously a tuple that has been moved to a different partition (see f16241bef7c), set the block number on the old tuple to an invalid value to indicate that fact. But the tuple offset was left untouched. That turned out to trigger a wal_consistency_checking failure as reported by Peter Geoghegan, as the offset wasn't always overwritten during WAL replay. Heikki observed that we're wasting valuable data by not putting information also in the offset. Thus set that to MovedPartitionsOffsetNumber when a tuple indicates it has moved. We continue to set the block number to MovedPartitionsBlockNumber, as that seems more likely to cause problems for code not updated to know about moved tuples. As t_ctid's offset number is now always set, this refinement also fixes the wal_consistency_checking issue. This technically is a minor disk format break, with previously created moved tuples not being recognized anymore. But since there not even has been a beta release since f16241bef7c... Reported-By: Peter Geoghegan Author: Heikki Linnakangas, Amul Sul Discussion: https://postgr.es/m/CAH2-Wzm9ty+1BX7-GMNJ=xPRg67oJTVeDNdA9LSyJJtMgRiCMA@mail.gmail.com
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: https://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 https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.