[jira] [Created] (ORC-456) [C++] Simplify code logic in RleEncoderV2

["Fang Zheng (JIRA)" <ji...@apache.org>]

Fang Zheng created ORC-456:
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             Summary: [C++] Simplify code logic in RleEncoderV2
                 Key: ORC-456
                 URL: https://issues.apache.org/jira/browse/ORC-456
             Project: ORC
          Issue Type: Improvement
          Components: C++
            Reporter: Fang Zheng


There is suboptimal code in RleEncoderV2::write() function (between lines 132-146). 

When a tailing min repeat run (i.e., 3 identical values) is detected and there is an ongoing variable run, the code copies the tailing identical values to a buffer named "tailVals", writes values before these values in literals buffer out, and then copies the 3 values back to the beginning of literals buffer.

Given that the last 3 values are known to be equal to the current value passed in write() function, we do not need to copy those values back and forth through the tailVals buffer. 




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