Optimize $push in $group to limit array size if followed by $slice of same field

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    • Query Optimization
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      If I have a pipeline

      {$group:{_id:"any", a:{$push:"$x"}}}, {$project:{a:{$slice:["$a",0,5]}}}

      We can pull in knowledge that only first 5 elements are needed from "a" in $group and stop pushing more elements after we have that many.

              Assignee:
              [DO NOT USE] Backlog - Query Optimization
              Reporter:
              Asya Kamsky
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                Created:
                Updated: