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Tom Lane authored
We've broken this code path at least twice in the past, so it's prudent
to have a test case that covers it.  To allow exercising the code path
without creating a very large (and slow to run) test case, redefine the
sort threshold to be bounded by maintenance_work_mem as well as the number
of available buffers.  While at it, fix an ancient oversight that when
building a temp index, the number of available buffers is not NBuffers but
NLocBuffer.  Also, if assertions are enabled, apply a direct test that the
sort actually does return the tuples in the expected order.

Peter Geoghegan

Patch: <CAM3SWZTBAo4hjbBd780+MrOKiKp_TMo1N3A0Rw9_im8gbD7fQA@mail.gmail.com>
9563d5b5
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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.  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/.