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This test used seqscans on tenk1, with LIMIT, to build test data. That works most of the time, but if the synchronized-seqscan logic kicks in, we get varying test data. This seems likely to explain the erratic test failures on buildfarm member chipmunk, which uses smaller-than-default shared_buffers. To fix, add ORDER BY clauses to force the ordering to be what it was implicitly being assumed to be. Peter Geoghegan had noticed this with respect to one of the trouble spots, though not the ones actually causing the chipmunk issue.
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/.