Baymine opened a new pull request, #46099:
URL: https://github.com/apache/doris/pull/46099
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
- Currently, the SQL cache system in Doris may miss cache hits due to
semantically identical queries being treated as different because of:
- Extra whitespace characters in the SQL query
- SQL comments that don't affect the query execution
- For example, these queries are semantically identical but would generate
different cache keys:
```sql
SELECT * FROM table;
-- Same query with comments and extra spaces
/* Comment */ SELECT * FROM table ;
```
- This PR improves the SQL cache hit rate by:
- Trimming whitespace from SQL queries
- Removing SQL comments before calculating the cache key MD5
- This ensures that queries that are semantically identical but differ only
in whitespace or comments will now hit the same cache entry, improving cache
efficiency and reducing unnecessary query executions
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [ ] Unit Test
- [x] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
- [ ] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
- Behavior changed:
- [ ] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [ ] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR should
merge into -->
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