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