jacktengg opened a new pull request, #54143:
URL: https://github.com/apache/doris/pull/54143
### What problem does this PR solve?
Cast decimal(38, 19) to decimal(38, 18), 100,000,000行。
before:
```
cast time: 8s840ms
cast time: 9s472ms
cast time: 8s947ms
cast time: 8s859ms
cast time: 9s233ms
cast time: 9s330ms
cast time: 9s359ms
```
After:
```
cast time: 5s289ms
cast time: 5s435ms
cast time: 5s343ms
cast time: 5s258ms
cast time 5s330ms
```
Cast decimalv2(27, 9) to decimalv3(38, 18)，100,000,000行。
before:
```
cast time: 3s726ms
cast time: 3s711ms
cast time: 3s717ms
```
After:
```
cast time: 1s141ms
cast time: 1s385ms
cast time: 1s216ms
cast time: 1s168ms
```
Problem Summary:
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [ ] Unit Test
- [ ] 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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