dirtysalt opened a new pull request #670:
URL: https://github.com/apache/orc/pull/670


   1. There is no need to use `>>>`. We have already flip `combinedHash` if 
it's negative and `position`  sign bit will be always zero.
   2. To set bit we have to mask `position` with 0x3f to keep the least 6 bits.
   


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