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0ea71c93a0
Consistently set a flag variable that tracks whether the current heap page has a dead item during lazy vacuum's heap scan. We missed the common case where there is an preexisting (or even a new) LP_DEAD heap line pointer. Also make it clear that the variable might be affected by an existing line pointer, say from an earlier opportunistic pruning operation. This distinction is important because it's the main reason why we can't just use the nearby tups_vacuumed variable instead. No backpatch. In theory failing to set the page level flag variable had no consequences. Currently it is only used to defensively check if a page marked all visible has dead items, which should never happen anyway (if it does then the table must be corrupt). Author: Masahiko Sawada <sawada.mshk@gmail.com> Diagnosed-By: Masahiko Sawada <sawada.mshk@gmail.com> Discussion: https://postgr.es/m/CAD21AoAtZb4+HJT_8RoOXvu4HM-Zd4HKS3YSMCH6+-W=bDyh-w@mail.gmail.com |
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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/.