Github user viirya commented on the pull request:

    https://github.com/apache/spark/pull/7238#issuecomment-124531812
  
    Instead of finding the partitions of summary files, now we just get the 
parent paths of summary files. Then we parse the partitions of part-files. The 
partition paths of part-files that are not included in the parent paths of 
summary files (i.e., they have no summary files along with) are filtered out. 
We then choose corresponding part-files that are needed to read for schema 
merging. 


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