[jira] [Created] (PARQUET-1855) [C++] Improve documentation on Metadata ownership

["Francois Saint-Jacques (Jira)" <ji...@apache.org>]

Francois Saint-Jacques created PARQUET-1855:
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             Summary: [C++] Improve documentation on Metadata ownership
                 Key: PARQUET-1855
                 URL: https://issues.apache.org/jira/browse/PARQUET-1855
             Project: Parquet
          Issue Type: Improvement
          Components: parquet-cpp
            Reporter: Francois Saint-Jacques


I had to look at the implementation to understand what are the lifetime relationship for the following objects:

* FileMetaData
* RowGroupMetaData
* ColumnChunkMetaData

From what I gather, a reference to the top-level FileMetaData must be hold for any of the children objects (RowGroupMetaData and ColumnChunkMetaData) lifetime. It is unclear if the original buffer from which the metadata was deserialized must be hold for the lifetime of the FIleMetaData object, I suspect it does not need to be kept.



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