Method xOpen

src/util/custom-table.cpp:162–165

	}

	static int xOpen(sqlite3_vtab* vtab, sqlite3_vtab_cursor** output) {
		*output = (new Cursor())->Downcast();
		return SQLITE_OK;
	}

	static int xClose(sqlite3_vtab_cursor* cursor) {
		delete Cursor::Upcast(cursor);