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resowner/README contained advice to use a PG_TRY block to restore the old CurrentResourceOwner value anywhere that that variable is transiently changed. That advice was only inconsistently followed, however, and on reflection it seems like unnecessary overhead. We don't bother with such a convention for transient CurrentMemoryContext changes, on the grounds that any (sub)transaction abort will start out by resetting CurrentMemoryContext to what it wants. But the same is true of CurrentResourceOwner, so there seems no need to treat it differently. Hence, remove PG_TRY blocks that exist only to restore CurrentResourceOwner before re-throwing the error. There are a couple of places that restore it along with some other actions, and I left those alone; the restore is probably unnecessary but no noticeable gain will result from removing it. Discussion: https://postgr.es/m/5236.1507583529@sss.pgh.pa.us
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: https://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 https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.