Avoid unnecessary clone() of QuerySolution as part of join reordering

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    • Type: Improvement
    • Resolution: Unresolved
    • Priority: Major - P3
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    • Affects Version/s: None
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    • Query Optimization
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      SERVER-110757 introduced the function to reorder joins arbitrarily but requires a copy of a QuerySolution tree. We should either:

      • Refactor QuerySolutionMap to hold a QuerySolutionNode by unique_ptr instead of QuerySolution
      • Introduce a releaseRoot() function on QuerySolution

            Assignee:
            Unassigned
            Reporter:
            Ben Shteinfeld
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              Created:
              Updated: