wuwenchi opened a new pull request, #51727:
URL: https://github.com/apache/doris/pull/51727
### What problem does this PR solve?
Related Issue: #48285
Problem Summary:
You can now create Iceberg branches and tags through Doris.
```sql
-- branch
alter table tb1 create branch b1;
alter table tb1 create branch if not exists b1;
alter table tb1 create or replace branch b1;
alter table tb1 create or replace branch b1 AS OF VERSION <version>;
alter table tb1 create or replace branch b1 AS OF VERSION <version> RETAIN 1
DAYS;
-- CREATE b1 at snapshot 1234, retain b1 for 30 days, and retain the latest
30 days. The latest 3 snapshot snapshots, and 2 days worth of snapshots.
alter table tb1 CREATE BRANCH b1 AS OF VERSION 1234 RETAIN 30 DAYS WITH
SNAPSHOT RETENTION 3 SNAPSHOTS 2 DAYS;
-- tag
alter table tb1 create tag t1;
alter table tb1 create tag if not eists t1;
alter table tb1 create or replace tag t1;
alter table tb1 create or replace tag t1 AS OF VERSION <version>;
-- CREATE t1 at snapshot 1234 and retain it for 1 year.
alter table tb1 create tag t1 AS OF VERSION 1234 RETAIN 365 DAYS
```
The supported time units include: DAYS, HOURS, MINUTES
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [x] 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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