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    Type:Improvement 
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    Resolution: Unresolved
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    Priority:Critical - P2 
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    Affects Version/s: None
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        Query Optimization
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Implement a cost-based choice between multi-planning and CBR with Sampling CE.
- The cost model for multi-planning will use cost calibration results from SPM-3658: Cost model for cost-based plan ranker.
- The cost model for Sampling CE will use the measurements performed throughout SPM-4214: Analyze and improve sampling CE performance.