[I] [C++][Parquet] Metadata generation: Nested physical schema builder [arrow]

["asfimport (via GitHub)" <gi...@apache.org>]

asfimport opened a new issue, #42291:
URL: https://github.com/apache/arrow/issues/42291

   The idea here is to define a simple API for creating logical schemas, which will be then automatically flattened in DFS order to a vector of SchemaElement structs. This will spare users from having to necessarily implement their own flattening / unflattening code
   
   **Reporter**: [Wes McKinney](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=wesm) / @wesm
   **Assignee**: Wes McKinney](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=wesm) / @wesm
   
   <sub>**Note**: *This issue was originally created as [PARQUET-444](https://issues.apache.org/jira/browse/PARQUET-444). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*</sub>


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