presto-spi/src/main/java/io/prestosql/spi/block/LazyBlock.java/LazyBlock/getRetainedSizeInBytes
class LazyBlock:    @Override
    public long getRetainedSizeInBytes()
    {
        if (!isLoaded()) {
            return INSTANCE_SIZE;
        }
        return INSTANCE_SIZE + getBlock().getRetainedSizeInBytes();
    }