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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