ZhangYu0123 opened a new pull request, #18320:
URL: https://github.com/apache/doris/pull/18320
# Proposed changes
Optimize constant empty string compare:
(1) When the constant empy string '' (size is 0), we can compare offsets in
SIMD directly.
````
q10: SELECT MobilePhoneModel, COUNT(DISTINCT UserID) AS u FROM hits WHERE
MobilePhoneModel <> '' GROUP BY MobilePhoneModel ORDER BY u DESC LIMIT 10;
q11: SELECT MobilePhone, MobilePhoneModel, COUNT(DISTINCT UserID) AS u FROM
hits WHERE MobilePhoneModel <> '' GROUP BY MobilePhone, MobilePhoneModel ORDER
BY u DESC LIMIT 10;
q12: SELECT SearchPhrase, COUNT(*) AS c FROM hits WHERE SearchPhrase <> ''
GROUP BY SearchPhrase ORDER BY c DESC LIMIT 10;
q13: SELECT SearchPhrase, COUNT(DISTINCT UserID) AS u FROM hits WHERE
SearchPhrase <> '' GROUP BY SearchPhrase ORDER BY u DESC LIMIT 10;
q14: SELECT SearchEngineID, SearchPhrase, COUNT(*) AS c FROM hits WHERE
SearchPhrase <> '' GROUP BY SearchEngineID, SearchPhrase ORDER BY c DESC LIMIT
10;
````
Issue Number: close #xxx
## Problem summary
Describe your changes.
## Checklist(Required)
* [ ] Does it affect the original behavior
* [ ] Has unit tests been added
* [ ] Has document been added or modified
* [ ] Does it need to update dependencies
* [ ] Is this PR support rollback (If NO, please explain WHY)
## Further comments
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[[email protected]](mailto:[email protected]) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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