[GitHub] [doris] xiaokang commented on pull request #10169: optimize substr performance

[GitBox]

xiaokang commented on PR #10169:
URL: https://github.com/apache/doris/pull/10169#issuecomment-1159934807

   I have done the performance comparison test. The test shows that:
   
   1. volnitsky algorithm with searching across rows is the best, which is 2.0x 
and 1.5x faster than std::search in two test cases. And gcc
   2. gcc-11.1.0 and clang-13.0.1 is almost the same, with little difference 
and is negligible since tested at different time.
   
   
![image](https://user-images.githubusercontent.com/680838/174521206-ca0781ba-adc7-42ee-91c5-1a6d0d21a226.png)
   
   


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