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For the upcoming pluggable table access methods it's quite inconvenient to store tuples as HeapTuples, as that'd require converting tuples from a their native format into HeapTuples. Instead use slots to manage epq tuples. To fit into that scheme, change the foreign data wrapper callback RefetchForeignRow, to store the tuple in a slot. Insist on using the caller provided slot, so it conveniently can be stored in the corresponding EPQ slot. As there is no in core user of RefetchForeignRow, that change was done blindly, but we plan to test that soon. To avoid duplicating that work for row locks, move row locks to just directly use the EPQ slots - it previously temporarily stored tuples in LockRowsState.lr_curtuples, but that doesn't seem beneficial, given we'd possibly end up with a significant number of additional slots. The behaviour of es_epqTupleSet[rti -1] is now checked by es_epqTupleSlot[rti -1] != NULL, as that is distinguishable from a slot containing an empty tuple. Author: Andres Freund, Haribabu Kommi, Ashutosh Bapat Discussion: https://postgr.es/m/20180703070645.wchpu5muyto5n647@alap3.anarazel.de
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/.