ZhangYu0123 opened a new pull request, #20143:
URL: https://github.com/apache/doris/pull/20143
## Proposed changes
Add fast path for col like '%%' or col like '%' or regexp '\\.*'
(1) like about 34% speed up when use count() test
support col like '%%' , col like '%', col not like '%%' , col not like
'%'
(2) regexp about 37% speed up when use count() test
support col regexp '\\.*', col not regexp '\\.*'
Q1: select count() From hits where url like '%';
Q2: select count() From hits where url regexp '\\.*';
before:
<img width="543" alt="image"
src="https://github.com/apache/doris/assets/67053339/caa79ee9-02f0-446b-8940-b7b47c05a7b8";>
<img width="578" alt="image"
src="https://github.com/apache/doris/assets/67053339/25e8a84c-d4cf-4796-931d-53bd5717292a";>
after:
<img width="564" alt="image"
src="https://github.com/apache/doris/assets/67053339/7dda3dcd-7055-4f49-a3de-ae9c78584e6d";>
<img width="580" alt="image"
src="https://github.com/apache/doris/assets/67053339/d4ca39b9-0ec3-4fc0-8015-3c4afb39470c";>
<--Describe your changes.-->
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