[SBE] Improve performance of $mergeObjects when used with $group

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    • Type: Task
    • Resolution: Fixed
    • Priority: Major - P3
    • 5.2.0
    • Affects Version/s: None
    • Component/s: None
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    • Fully Compatible
    • QE 2021-10-18, QE 2021-11-01
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    • 3
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      When an accumulator operator is used with $group, the engine performs an accumulation process that processes each input value and updates/maintains "accumulator state" for each group. For each value processed, the current SBE implementation of the $mergeObjects operator will always update the accumulator state by allocating a new object rather than modifying the current existing object held in the accumulator state. This hurts the performance of the $mergeObjects operator in SBE.

      The goal of this task is to improve the SBE implementation of $mergeObjects to avoid allocating a new object each time it processes a value.

       

              Assignee:
              Drew Paroski
              Reporter:
              Yoon Soo Kim (Inactive)
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                Created:
                Updated:
                Resolved: