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1. Add a dependence operator which input is fact-source operator and DynamicPartitionCollector operator, this could ensure the DynamicPartitionCollector operator is scheduled before the fact-source operator . The dependency edge could be omitted if the fact source is chained with the join operator via the multiple-inputs tasks and there is already an edge between dim source and fact source. 

1. Pros:

1. The optimization results are deterministic
2. the change is minimal
3. users can see the data dependencies between them from the topology

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