alamb opened a new pull request #657:
URL: https://github.com/apache/arrow-datafusion/pull/657


   This is the test harness I intend to use to validate the fix for 
https://github.com/apache/arrow-datafusion/issues/656 and 
https://github.com/apache/arrow-datafusion/issues/649. 
   
   # Rationale:
   Parquet pruning is broken 
(https://github.com/apache/arrow-datafusion/issues/656 see 
https://github.com/apache/arrow-datafusion/issues/649) but all our tests are 
passing. This is not good ...
   
   The test and infrastructure is pretty large itself so I wanted to get it 
reviewed separately prior to the actual bug fixes
   
   # Changes
   1. Add an end-to-end test for parquet pruning
   2. Add statistics to parquet reader (that are used in the tests)
   3. Add a "plan_statistics" function to gather all `SQLMetrics` after a plan 
has been executed
   
   I plan to extend the parquet test to cover more cases as I work on fixing 
the bugs
   
   # Are there any user-facing changes?
   There are some new user facing SQL metrics
   


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