presto-main/src/main/java/io/prestosql/operator/OuterLookupSource.java/OuterLookupSource/getNextJoinPosition
class OuterLookupSource:    @Override
    public long getNextJoinPosition(long currentJoinPosition, int probePosition, Page allProbeChannelsPage)
    {
        return lookupSource.getNextJoinPosition(currentJoinPosition, probePosition, allProbeChannelsPage);
    }