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The tuplesort/tuplestore memory management logic assumed that the chunk allocation overhead for its memtuples array could not increase when increasing the array size. This is and always was true for tuplesort, but we (I, I think) blindly copied that logic into tuplestore.c without noticing that the assumption failed to hold for the much smaller array elements used by tuplestore. Given rather small work_mem, this could result in an improper complaint about "unexpected out-of-memory situation", as reported by Brent DeSpain in bug #13530. The easiest way to fix this is just to increase tuplestore's initial array size so that the assumption holds. Rather than relying on magic constants, though, let's export a #define from aset.c that represents the safe allocation threshold, and make tuplestore's calculation depend on that. Do the same in tuplesort.c to keep the logic looking parallel, even though tuplesort.c isn't actually at risk at present. This will keep us from breaking it if we ever muck with the allocation parameters in aset.c. Back-patch to all supported versions. The error message doesn't occur pre-9.3, not so much because the problem can't happen as because the pre-9.3 tuplestore code neglected to check for it. (The chance of trouble is a great deal larger as of 9.3, though, due to changes in the array-size-increasing strategy.) However, allowing LACKMEM() to become true unexpectedly could still result in less-than-desirable behavior, so let's patch it all the way back.
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/.