Fang Zheng created ORC-464:
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Summary: [C++] Avoid computing zigzag values for DELTA and
SHORT_REPEAT encoding
Key: ORC-464
URL: https://issues.apache.org/jira/browse/ORC-464
Project: ORC
Issue Type: Improvement
Components: C++
Reporter: Fang Zheng
In current implementation, RleEncoderV2::determineEncoding() always computes
zigzag values before determining the encoding type. However, zigzag values are
only needed for DIRECT and PATCHED_BASE encoding, but not for DELTA and
SHORT_REPEAT. For efficiency
, we shall only perform zigzag computation when it's determined to be necessary.
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