mukunku opened a new issue #10954:
URL: https://github.com/apache/arrow/issues/10954


   Hello,
   
   I'm using the [parquet-dotnet](https://github.com/aloneguid/parquet-dotnet) 
library to read parquet files and I can see there is an 
[ARROW:schema](https://arrow.apache.org/docs/cpp/parquet.html#serialization-details)
 within the custom metadata,. Which is a Base64 encoded string that should 
represent a Arrow IPC Message object, if I'm understanding this correctly.
   
   So I was wondering if there was any to deserialize this message within the 
library? I took a look through the code and the methods available to me; 
especially 
[Schema.cs](https://github.com/apache/arrow/blob/master/csharp/src/Apache.Arrow/Schema.cs)
 and 
[MessageSerializer.cs](https://github.com/apache/arrow/blob/master/csharp/src/Apache.Arrow/Ipc/MessageSerializer.cs).
   
   This is a sample schema that I was hoping to deserialize:
   ```
   
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
 
AAMT///8EAAAAaXRlbQAAAAAJAAAAdXRmOF9saXN0AAAA3P///wAAAQxkAAAAFAAAAAQAAAABAAAAHAAAAAQABAAEAAAAEAAUAAgABgAHAAwAAAAQABAAAAAAAAECJAAAABQAAAAEAAAAAAAAAAgADAAIAAcACAAAAAAAAAFAAAAABAAAAGl0ZW0AAAAACgAAAGludDY0X2xpc3QAAA==
   ```
   
   Thanks.


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