[jira] [Created] (ARROW-9299) Expose ORC metadata() in Python ORCFile

["Jeremy Dyer (Jira)" <ji...@apache.org>]

Jeremy Dyer created ARROW-9299:
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             Summary: Expose ORC metadata() in Python ORCFile
                 Key: ARROW-9299
                 URL: https://issues.apache.org/jira/browse/ARROW-9299
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++, Python
    Affects Versions: 0.17.1
            Reporter: Jeremy Dyer


There is currently no way for a user to directly access the underlying ORC metadata of a given file. It seems the C++ functions and objects already existing and rather the plumbing is just missing the the cython/python and potentially a few c++ shims. Giving users the ability to retrieve the metadata without first reading the entire file could help numerous applications to increase their query performance by allowing them to intelligently determine which ORC stripes should be read.  

This would allow for something like 
{code:java}
import pyarrow as pa 
orc_metadata = pa.orc.ORCFile(filename).metadata()
{code}



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