suxiaogang223 opened a new pull request, #61223:
URL: https://github.com/apache/doris/pull/61223
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: N/A
Problem Summary:
When `select ... into outfile` uses `delete_existing_files=true`, parallel
outfile writers can race on directory cleanup and delete files uploaded by
other writers. This change moves remote outfile cleanup to FE so it happens
once before query execution, and clears the delete flag before sending sink
options to BE. For `file:///` local outfile, cleanup cannot be coordinated in
FE, so the planner falls back to `GATHER` when `delete_existing_files=true` to
avoid deletion races. A regression test is added to verify parallel outfile
with `delete_existing_files=true` does not lose exported rows.
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [x] 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:
- [x] Yes. `delete_existing_files=true` is now handled once in FE for
remote outfile, and local outfile falls back to serialized execution.
- Does this need documentation?
- [x] 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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