presto-spi/src/main/java/io/prestosql/spi/block/SingleRowBlock.java/SingleRowBlock/getRetainedSizeInBytes
class SingleRowBlock:    @Override
    public long getRetainedSizeInBytes()
    {
        long retainedSizeInBytes = INSTANCE_SIZE;
        for (int i = 0; i < fieldBlocks.length; i++) {
            retainedSizeInBytes += getRawFieldBlock(i).getRetainedSizeInBytes();
        }
        return retainedSizeInBytes;
    }