Mryange cc6ff12097 [opt](function) Optimize the trim function for single-char inputs (#3… (#37799) ...

https://github.com/apache/doris/pull/36497

before
```
mysql [test]>select count(ltrim(str,"1")) from stringDb2;
+------------------------+
| count(ltrim(str, '1')) |
+------------------------+
|               64000000 |
+------------------------+
1 row in set (7.79 sec)
```

now
```
mysql [test]>select count(ltrim(str,"1")) from stringDb2;
+------------------------+
| count(ltrim(str, '1')) |
+------------------------+
|               64000000 |
+------------------------+
1 row in set (0.73 sec)
```

## Proposed changes

Issue Number: close #xxx

<!--Describe your changes.-->

2024-07-16 17:52:52 +08:00

..

bits.h

…

lower_upper_impl.h

…

vstring_function.h

[opt](function) Optimize the trim function for single-char inputs (#3… (#37799)

2024-07-16 17:52:52 +08:00