presto-main/src/main/java/io/prestosql/operator/LookupJoinPageBuilder.java/LookupJoinPageBuilder/toString
class LookupJoinPageBuilder:    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("estimatedSize", estimatedProbeBlockBytes + buildPageBuilder.getSizeInBytes())
                .add("positionCount", buildPageBuilder.getPositionCount())
                .toString();
    }