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My expanded-objects patch (commit 1dc5ebc9077ab742) included code to make plpgsql pass expanded-object variables as R/W pointers to certain functions that are trusted for modifying such variables in-place. However, that optimization got broken by commit 6c82d8d1fdb1f126, which arranged to share a single ParamListInfo across most expressions evaluated by a plpgsql function. We don't want a R/W pointer to be passed to other functions just because we decided one function was safe! Fortunately, the breakage was in the other direction, of never passing a R/W pointer at all, because we'd always have pre-initialized the shared array slot with a R/O pointer. So it was still functionally correct, but we were back to O(N^2) performance for repeated use of "a := a || x". To fix, force an unshared param array to be used when the R/W param optimization is active. Commit 6c82d8d1fdb1f126 is in HEAD only, so no need for a back-patch.
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/.