zhjwpku opened a new pull request, #1374:
URL: https://github.com/apache/orc/pull/1374
### What changes were proposed in this pull request?
change `void addUserMetadata(const std::string name, const std::string
value) override;`
to `void addUserMetadata(const std::string& name, const std::string&
value) override;`
to reduce copy construct.
### Why are the changes needed?
performance improvement.
### How was this patch tested?
This patch introduces no new features and all the exist test cases passed.
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