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  1. Core Server
  2. SERVER-55727

Allow rewrite to push inclusion meta projections past $unpackBucket

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    • Type: Icon: Task Task
    • Resolution: Won't Fix
    • Priority: Icon: Major - P3 Major - P3
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    • Query Optimization 2021-04-19, Query Optimization 2021-05-03

      If we have an inclusion $project only on meta after an $unpackBucket, we can move the $project before $unpackBucket. For example, roughly:

      {$unpackBucket: {exclude: [], metaField: "myMeta"}},
      {$project : {myMeta.a : 1, myMeta.b: 1, _id: 0}}
      --->
      {$project : {meta.a : 1, meta.b: 1}}
      {$unpackBucket: {exclude: [], metaField: "myMeta"}},
       

            Assignee:
            hana.pearlman@mongodb.com Hana Pearlman
            Reporter:
            hana.pearlman@mongodb.com Hana Pearlman
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