presto-main/src/main/java/io/prestosql/operator/NestedLoopJoinPagesBuilder.java/NestedLoopJoinPagesBuilder/compact
class NestedLoopJoinPagesBuilder:    public void compact()
    {
        checkState(!finished, "NestedLoopJoinPagesBuilder is finished");

        pages.stream()
                .forEach(Page::compact);
        estimatedSize = pages.stream()
                .mapToLong(Page::getRetainedSizeInBytes)
                .sum();
    }