adamreeve commented on PR #8671:
URL: https://github.com/apache/arrow-rs/pull/8671#issuecomment-3440476552

   After that latest change to not count the type size within 
`ColumnDescriptor`, my test program that loads meta data into a vector and 
reports the heap size using `ParquetMetaData::memory_size()` agrees exactly 
with the total heap allocations reported by HeapTrack, after accounting for a 
constant overhead reported by HeapTrack that is independent of the number of 
copies of the metadata loaded.


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