BiteTheDDDDt opened a new pull request, #64964:
URL: https://github.com/apache/doris/pull/64964
### What problem does this PR solve?
Issue Number: None
Related PR: None
Problem Summary: Recursive CTE target generation was deduplicated by backend
address. When multiple recursive CTE scan fragment instances were assigned to
the same backend, only the first instance id was sent as a `TRecCTETarget`; the
remaining scan instances could wait forever for data/EOS, matching the timeout
reported in DORIS-26687.
This PR builds recursive CTE targets per assigned fragment instance while
keeping reset/rerun backend addresses deduplicated by backend.
### Release note
None
### Check List (For Author)
- Test: Regression test / Unit Test
- Added `rec_cte_parallel_targets` regression coverage.
- Added FE unit coverage for multiple RecCTE scan targets on the same
backend.
- Not run locally per request.
- Behavior changed: No
- Does this need documentation: No
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