[jira] [Created] (ARROW-471) [Python] Enable ParquetFile to pass down separately-obtained file metadata

[Wes McKinney (JIRA)]

Wes McKinney created ARROW-471:
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             Summary: [Python] Enable ParquetFile to pass down 
separately-obtained file metadata
                 Key: ARROW-471
                 URL: https://issues.apache.org/jira/browse/ARROW-471
             Project: Apache Arrow
          Issue Type: New Feature
          Components: Python
            Reporter: Wes McKinney


As part of the procedure for reading a directory of files, we will only want to 
read a file's metadata once. 



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