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The REDO routine for nbtree's xl_btree_vacuum record type hasn't performed a "pin scan" since commit 3e4b7d87 went in, so clearly there isn't any point in VACUUM WAL-logging information that won't actually be used. Finish off the work of commit 3e4b7d87 (and the closely related preceding commit 687f2cd7) by removing the code that generates this unused information. Also remove the REDO routine code disabled by commit 3e4b7d87. Replace the unneeded lastBlockVacuumed field in xl_btree_vacuum with a new "ndeleted" field. The new field isn't actually needed right now, since we could continue to infer the array length from the overall record length. However, an upcoming patch to add deduplication to nbtree needs to add an "items updated" field to xl_btree_vacuum, so we might as well start being explicit about the number of items now. (Besides, it doesn't seem like a good idea to leave the xl_btree_vacuum struct without any fields; the C standard says that that's undefined.) nbtree VACUUM no longer forces writing a WAL record for the last block in the index. Writing out a WAL record with no items for the final block was supposed to force processing of a lastBlockVacuumed field by a pin scan. Bump XLOG_PAGE_MAGIC because xl_btree_vacuum changed. Discussion: https://postgr.es/m/CAH2-WzmY_mT7UnTzFB5LBQDBkKpdV5UxP3B5bLb7uP%3D%3D6UQJRQ%40mail.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/.