presto-orc/src/main/java/io/prestosql/orc/writer/FloatColumnWriter.java/FloatColumnWriter/getRetainedBytes
class FloatColumnWriter:    @Override
    public long getRetainedBytes()
    {
        long retainedBytes = INSTANCE_SIZE + dataStream.getRetainedBytes() + presentStream.getRetainedBytes();
        for (ColumnStatistics statistics : rowGroupColumnStatistics) {
            retainedBytes += statistics.getRetainedSizeInBytes();
        }
        return retainedBytes;
    }