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By using only the macro that checks infomask bits HEAP_XMAX_IS_LOCKED_ONLY to verify whether a multixact is not an updater, and not the full HeapTupleHeaderIsOnlyLocked, it would come to the wrong result in case of a multixact containing an aborted update; therefore returning the wrong result code. This would cause predicate.c to break completely (as in bug report #8273 from David Leverton), and certain index builds would misbehave. As far as I can tell, other callers of the bogus routine would make harmless mistakes or not be affected by the difference at all; so this was a pretty narrow case. Also, no other user of the HEAP_XMAX_IS_LOCKED_ONLY macro is as careless; they all check specifically for the HEAP_XMAX_IS_MULTI case, and they all verify whether the updater is InvalidXid before concluding that it's a valid updater. So there doesn't seem to be any similar bug. |
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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: 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/.