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  1. Documentation
  2. DOCS-9499

Docs for SERVER-20506: Conditionally order $match with $unwind

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      Engineering Ticket Description:

      The subset of a $match following an $unwind that does not filter on the unwound field can be moved up in the pipeline.

      For example:

      [
  {'$unwind' : "$x"}, 
  {'$match' : {_id : 1, x : {'$gt': 3}  } }
]

      is equivalent to:

      [ 
   {'$match' : {_id : 1} }, 
   {'$unwind' : "$x"}, 
   {'$match' : {x : {'$gt': 3}} }
]

            Assignee:
            andrew.aldridge@mongodb.com Andrew Aldridge
            Reporter:
            emily.hall Emily Hall
            Votes:
            1 Vote for this issue
            Watchers:
            3 Start watching this issue

              Created:
              Updated:
              Resolved:
              1 year, 5 weeks ago