Wes McKinney created PARQUET-1798:
-------------------------------------

             Summary: [C++] Review logic around automatic assignment of 
field_id's
                 Key: PARQUET-1798
                 URL: https://issues.apache.org/jira/browse/PARQUET-1798
             Project: Parquet
          Issue Type: Improvement
          Components: parquet-cpp
            Reporter: Wes McKinney
             Fix For: cpp-1.6.0


At schema deserialization (from Thrift) time, we are assigning a default 
field_id to the Schema node based on a depth-first ordering of notes. This 
means that a round trip (load, then write) will cause field_id's to be written 
that weren't there before. I'm not sure this is the desired behavior.

We should examine this in more detail and possible change it. See also 
discussion in ARROW-7080 https://github.com/apache/arrow/pull/6408



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