Function GetForeignTableOnSegment

src/backend/foreign/foreign.c:412–456

}

static ForeignTable *
GetForeignTableOnSegment(Oid relid)
{
	Form_pg_foreign_table_seg tablesegform;
	ForeignTable *ft = NULL;
	Relation 	foreignTableRel;
	ScanKeyData	ftkey;
	SysScanDesc	ftscan;
	HeapTuple	fttuple;
	int 		i;
	int 		segNumber;

	segNumber = GetForeignTableSegNumbers(relid);

	foreignTableRel = table_open(ForeignTableRelationSegId, AccessShareLock);

	ScanKeyInit(&ftkey,
				Anum_pg_foreign_table_seg_ftsrelid,
				BTEqualStrategyNumber, F_OIDEQ,
				ObjectIdGetDatum(relid));

	ftscan = systable_beginscan(foreignTableRel, InvalidOid,
								false, NULL, 1, &ftkey);

	i = 0;
	while (HeapTupleIsValid(fttuple = systable_getnext(ftscan)))
	{

		if (i == qe_idx)
		{
			tablesegform = (Form_pg_foreign_table_seg) GETSTRUCT(fttuple);
			ft = (ForeignTable *) palloc(sizeof(ForeignTable));
			ft->relid = relid;
			ft->serverid = tablesegform->ftsserver;
			break;
		}
		i++;
	}

	systable_endscan(ftscan);

	table_close(foreignTableRel, AccessShareLock);

	return ft;
}

/*
 * GetForeignTable - look up the foreign table definition by relation oid.