Function apply_server_options

contrib/postgres_fdw/postgres_fdw.c:5874–5919

* Parse options from foreign server and apply them to fpinfo. * * New options might also require tweaking merge_fdw_options(). */

 * New options might also require tweaking merge_fdw_options().
 */
static void
apply_server_options(PgFdwRelationInfo *fpinfo)
{
	ListCell   *lc;

	foreach(lc, fpinfo->server->options)
	{
		DefElem    *def = (DefElem *) lfirst(lc);

		if (strcmp(def->defname, "use_remote_estimate") == 0)
		{
			/*
			 * GPDB_13_MERGE_FIXME: For updable statement, different forked Backends by Master
			 * (QD and entrydb instances)
			 * will hold Exclusive lock on the same table, which causes lock hang issue.
			 * For Postgres, there is only one backend, and connnections have been shared,
			 * so the issue doesn't exist.
			 *
			 * For example, following query will hang:
			 * SELECT *
			 * FROM ft1, ft2, ft4, ft5, local_tbl
			 * WHERE ft1.c1 = ft2.c1 AND
			 *		 ft1.c2 = ft4.c1 AND
			 *		 ft1.c2 = ft5.c1 AND
			 *		 ft1.c2 = local_tbl.c1 AND
			 *		 ft1.c1 < 100 AND
			 *		 ft2.c1 < 100 FOR UPDATE;
			 */
			elog(WARNING, "fdw option 'use_remote_estimate' is not supported.");
			fpinfo->use_remote_estimate = false;
		}
		else if (strcmp(def->defname, "fdw_startup_cost") == 0)
			(void) parse_real(defGetString(def), &fpinfo->fdw_startup_cost, 0,
							  NULL);
		else if (strcmp(def->defname, "fdw_tuple_cost") == 0)
			(void) parse_real(defGetString(def), &fpinfo->fdw_tuple_cost, 0,
							  NULL);
		else if (strcmp(def->defname, "extensions") == 0)
			fpinfo->shippable_extensions =
				ExtractExtensionList(defGetString(def), false);
		else if (strcmp(def->defname, "fetch_size") == 0)
			(void) parse_int(defGetString(def), &fpinfo->fetch_size, 0, NULL);
		else if (strcmp(def->defname, "async_capable") == 0)
			fpinfo->async_capable = defGetBoolean(def);
	}
}

/*
 * Parse options from foreign table and apply them to fpinfo.