presto-main/src/main/java/io/prestosql/operator/index/IndexLookupSource.java/IndexLookupSource/getJoinPosition
class IndexLookupSource:    @Override
    public long getJoinPosition(int position, Page hashChannelsPage, Page allChannelsPage, long rawHash)
    {
        // TODO update to take advantage of precomputed hash
        return getJoinPosition(position, hashChannelsPage, allChannelsPage);
    }