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fix: extract subgraph result from GraphResponse in parallel execution (#4516) #4524

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fix: extract subgraph result from GraphResponse in parallel execution (#4516) #4524

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21 changes: 20 additions & 1 deletion ...ai-alibaba-graph-core/src/main/java/com/alibaba/cloud/ai/graph/executor/NodeExecutor.java
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Original file line number Diff line number Diff line change
Expand Up @@ -839,7 +839,26 @@ private Flux<GraphResponse<NodeOutput>> handleParallelGraphFlux(GraphRunnerConte
String nodeId = graphFlux.getNodeId();
Object nodeData = nodeDataRefs.get(nodeId).get();

combinedResultMap.put(graphFlux.getKey(),nodeData);
// Extract actual result data from GraphResponse completion signals
// (e.g., from subgraph completion or streaming aggregation done events).
// Without this extraction, the raw GraphResponse object would be stored
// in the parent state, which serializes as empty '{}' and loses the
// subgraph's output data. This mirrors the extraction logic used in
// processGraphResponseFlux for non-parallel subgraph execution.
if (nodeData instanceof GraphResponse<?> graphResponse
&& graphResponse.resultValue().isPresent()) {
Object resultVal = graphResponse.resultValue().get();
if (resultVal instanceof Map<?, ?>) {
@SuppressWarnings("unchecked")
Map<String, Object> resultMap = (Map<String, Object>) resultVal;
combinedResultMap = OverAllState.updateState(
combinedResultMap, resultMap, context.getKeyStrategyMap());
} else {
combinedResultMap.put(graphFlux.getKey(), resultVal);
}
} else {
combinedResultMap.put(graphFlux.getKey(), nodeData);
}
}

// Merge non-ParallelGraphFlux state
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