coderex2522 opened a new pull request, #1114:
URL: https://github.com/apache/orc/pull/1114

   ### What changes were proposed in this pull request?
   The patch will optimize the seekToRow function.
   
   ### Why are the changes needed?
   The RowReader::seekToRow() function always call startNextStripe() to seek to 
the beginning of target stripe.
   However, when PPD is enabled many calls are still staying in the same stripe 
which results in many unnecessary calls. 
   
   ### How was this patch tested?
   The original UTs(TestPredicatePushdown, 
DictionaryEncoding::multipleStripesWithIndex, 
DictionaryEncoding::multipleStripesWithoutIndex) will cover the patch.
   


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