fix bug on _to query result.
fix bug on _to query result.

jongwook/incubator-s2graph,SteamShon/incubator-s2graph,SteamShon/incubator-s2graph,daewon/incubator-s2graph,daewon/incubator-s2graph,jongwook/incubator-s2graph,SteamShon/incubator-s2graph