yujun777 opened a new pull request, #47036:
URL: https://github.com/apache/doris/pull/47036
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
PR do two things:
1. simplify cast date like from high scale to small scale. example:
```
# suppose c_datetime_2 is datetime(2)
cast(c_datetime_2 as date) = '2020-12-20' ---> c_datetime_2 >=
'2020-12-20 00:00:00.00' and c_datetime_2 <= '2020-12-20 23:59:59.99'
cast(c_datetime_2 as datetime(1)) > '2020-12-20 12:34:56.7' -->
c_datetime_2 > '2020-12-20 12:34:56.79'
```
2. handle compare date like with overflow. before this PR, it will not
simplify if met overflow, but this PR will simplify too. example:
```
# suppose c_datetime_2 is datetime(2), c_date is date
cast(c_date as datetime) < '9999-12-31 23:59:59' --> c_date <=
'9999-12-31'
cast(c_date as datetime) >= '9999-12-31 23:59:59' --> c_date >
'9999-12-31'
cast(c_datetime_2 as datetime(3)) < '9999-12-31 23:59:59.995' -->
c_datetime_2 <= '9999-12-31 23:59:59.99'
cast(c_datetime_2 as datetime(3)) >= '9999-12-31 23:59:59.995' -->
c_datetime_2 > '9999-12-31 23:59:59.99'
```
### 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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