nitao

[Feature] support max_by built-in function (#3288)

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[Feature] support max_by built-in function (#3288)

resubmit pipeline client max connections is too large

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## What type of PR is this? - [ ] API-change - [ ] BUG - [x] Improvement - [ ] Documentation - [ ] Feature - [ ] Test...

### Is there an existing issue for the same tech request? - [X] I have checked the existing issues. ### Does this tech request not affect user experience? - [X]...

[Performance]: memcache with rc bytes 导致tp以及ap性能下降太多

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### Is there an existing issue for performance? - [X] I have checked the existing issues. ### Environment ```Markdown 在129环境上测试，tpch100g q1， memcache设置成32g或者2g都不影响测试结果。 在主分支上测试，q1平均21秒，revert掉memcache那个 pr之后，平均性能是8秒。性能差距太明显 ``` ### Details of Performance 在主分支上测试，q1平均21秒...

### Is there an existing issue for the same tech request? - [X] I have checked the existing issues. ### Does this tech request not affect user experience? - [X]...

[Bug]: ut test fail in TestMysqlResultSet

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### Is there an existing issue for the same bug? - [X] I have checked the existing issues. ### Branch Name main ### Commit ID lastest ### Other Environment Information...

change sels from int64 to int32 in shuffle operator

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## What type of PR is this? - [ ] API-change - [ ] BUG - [x] Improvement - [ ] Documentation - [ ] Feature - [ ] Test...

add preAlloc method for reldata

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## What type of PR is this? - [ ] API-change - [ ] BUG - [x] Improvement - [ ] Documentation - [ ] Feature - [ ] Test...

## What type of PR is this? - [ ] API-change - [x] BUG - [ ] Improvement - [ ] Documentation - [ ] Feature - [ ] Test...

### Is there an existing issue for the same bug? - [X] I have checked the existing issues. ### Branch Name main ### Commit ID lastest ### Other Environment Information...