Mryange opened a new pull request, #66740:
URL: https://github.com/apache/doris/pull/66740

   Problem Summary: Historical time zones can have UTC offsets with second 
precision. For example, `Asia/Shanghai` used `+08:05:43` in 1900. TIMESTAMPTZ 
string formatting previously emitted only the hour and minute components, 
producing `+08:05` and losing 43 seconds. As a result, the rendered value could 
not be converted back to the same TIMESTAMPTZ value.
   
   Root cause: `TimestampTzValue::to_string()` obtained the complete offset in 
seconds from cctz but formatted only `HH:MM`. This change appends `:SS` when 
the offset contains a non-zero seconds component. Minute-aligned offsets retain 
the existing `HH:MM` output format.
   
   ### 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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