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execCurrent.c's search_plan_tree() must recognize a CustomScan on the target relation. This would only be helpful for custom providers that support CurrentOfExpr quals, which is probably a bit far-fetched, but it's not impossible I think. But even without assuming that, we need to recognize a scanned-relation match so that we will properly throw error if the desired relation is being scanned with both a CustomScan and a regular scan (ie, self-join). Also recognize ForeignScanState for similar reasons. Supporting WHERE CURRENT OF on a foreign table is probably even more far-fetched than it is for custom scans, but I think in principle you could do it with postgres_fdw (or another FDW that supports the ctid column). This would be a back-patchable bug fix if existing FDWs handled CurrentOfExpr, but I doubt any do so I won't bother back-patching.
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/.