milesgranger opened a new pull request, #13821:
URL: https://github.com/apache/arrow/pull/13821

   Will fix [ARROW-13763](https://issues.apache.org/jira/browse/ARROW-13763)
   
   A separate Jira issue will be made to address closing files in V2 
ParquetDataset, which needs to be handled in the C++ layer. 
   
   Adds context manager to `pq.ParquetFile` to close input file, and ensure 
reads within `pq.ParquetDataset` are closed.
   
   ```python
   buf: io.BytesIO
   
   with pq.ParquetFile(buf) as parquet:
       table = parquet.read()
   assert buf.closed
   
   # or...
   
   p = pq.ParquetFile(buf)
   table = p.read()
   assert not buf.closed
   
   p.close()
   assert buf.closed
   ```


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