BiteTheDDDDt opened a new pull request, #64130:
URL: https://github.com/apache/doris/pull/64130
### What problem does this PR solve?
Issue Number: None
Related PR: None
Problem Summary: Runtime filter merge coordinator selection in FE used a
fixed first/top instance. For stable fragment and worker ordering, repeated
queries could assign BE-side runtime filter coordinator work to the same
backend. This change adds a shared round-robin selector and selects from
distinct participating BEs. The legacy Coordinator keeps candidates aligned
with the BE fallback path by choosing the first local param for each BE in
fragment send order, while the Nereids thrift builder selects from all
participating workers.
### Release note
None
### Check List (For Author)
- Test: Unit Test
- ./run-fe-ut.sh --run org.apache.doris.qe.runtime.ThriftPlansBuilderTest
- ./build.sh --fe
- Behavior changed: Yes. Runtime filter coordinator selection is balanced
across participating BEs instead of using a fixed first/top BE.
- Does this need documentation: No
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