branch-4.1: [fix](transaction) select txn insert backend from current cluster #63634#63952
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branch-4.1: [fix](transaction) select txn insert backend from current cluster #63634#63952github-actions[bot] wants to merge 1 commit into
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…3634) ### What problem does this PR solve? Problem Summary: In cloud mode with multiple compute groups, transactional `insert into values` may fail with: `Cannot invoke "org.apache.doris.system.Backend.getHost()" because "backend" is null` The root cause is that `InsertStreamTxnExecutor` selected a backend id from all clusters through `selectBackendIdsByPolicy(policy, 1)`, but then looked up the selected id from `getBackendsByCurrentCluster()`. If the selected backend belonged to another compute group, the lookup returned null and FE hit an NPE when calling `backend.getHost()`. This PR changes txn insert backend selection to use the current cluster backend snapshot as the candidate list, so the selected backend is always from the current compute group.
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Cherry-picked from #63634