heguanhui opened a new pull request, #63628:
URL: https://github.com/apache/doris/pull/63628
### What problem does this PR solve?
Issue Number: close #63322
Problem Summary: DropRowPolicyCommand does not validate whether the user or
role specified in the DROP ROW POLICY statement actually exists. This is
inconsistent with CreatePolicyCommand, which checks user existence via
`doesUserExist()` and role existence via `doesRoleExist()`. Without this
validation, a typo in the user or role name could silently match no policy, or
the user might mistakenly believe the drop succeeded.
### Release note
DROP ROW POLICY now validates that the specified user and role exist,
returning an error if they do not. This makes the behavior consistent with
CREATE ROW POLICY.
### Check List (For Author)
- Test
- [x] Unit Test
- Behavior changed:
- [x] Yes. DROP ROW POLICY now throws AnalysisException when the
specified user or role does not exist, whereas previously it would proceed
without validation.
- Does this need documentation?
- [x] No.
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label
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