BiteTheDDDDt opened a new pull request, #65598:
URL: https://github.com/apache/doris/pull/65598
### What problem does this PR solve?
Issue Number: None
Related PR: #64683
Problem Summary: Backport #64683 to branch-4.1. Broadcast join runtime
filters are globally merged by accepting one producer, but every build-side BE
still creates and sends the same filter. This backport adds
`runtime_filter_broadcast_join_producer_num` and limits Nereids broadcast
runtime-filter producers with remote targets while preserving local-only and
non-broadcast behavior.
For branch-4.1, the implementation keeps the branch's existing
merge-instance selection and prefers that worker when selecting the bounded
producer set. The FE tests are carried in a branch-compatible
`RuntimeFiltersThriftBuilderTest`.
### Release note
Add session variable `runtime_filter_broadcast_join_producer_num` to limit
Nereids broadcast join runtime filter producers.
### Check List (For Author)
- Test: Unit Test
- `./run-fe-ut.sh --run
org.apache.doris.qe.runtime.RuntimeFiltersThriftBuilderTest,org.apache.doris.qe.SessionVariablesTest`
- 13 tests passed, 0 failures, 0 errors
- `git diff --check upstream/branch-4.1..HEAD`
- Behavior changed: Yes. Nereids broadcast runtime filters with remote
targets use at most the configured number of producer BEs; values less than or
equal to 0 disable the limit.
- Does this need documentation: No
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