presto-main/src/main/java/io/prestosql/operator/LookupJoinPageBuilder.java/LookupJoinPageBuilder/isFull
class LookupJoinPageBuilder:    public boolean isFull()
    {
        return estimatedProbeBlockBytes + buildPageBuilder.getSizeInBytes() >= DEFAULT_MAX_PAGE_SIZE_IN_BYTES ||
                buildPageBuilder.getPositionCount() >= MAX_BATCH_SIZE ||
                buildPageBuilder.isFull();
    }