presto-main/src/main/java/io/prestosql/operator/PartitionedLookupSourceFactory.java/SpilledLookupSource/getJoinPosition
class SpilledLookupSource:        @Override
        public long getJoinPosition(int position, Page hashChannelsPage, Page allChannelsPage, long rawHash)
        {
            throw new UnsupportedOperationException();
        }