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Don't use simple_heap_insert to insert the tuple to a sequence relation. simple_heap_insert creates a heap insertion WAL record, and replaying that will create a regular heap page without the special area containing the sequence magic constant, which is wrong for a sequence. That was not a bug because we always created a sequence WAL record after that, and replaying that overwrote the bogus heap page, and the transient state could never be seen by another backend because it was only done when creating a new sequence relation. But it's simpler and cleaner to avoid that in the first place.
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/.