issue with $sort when used in combination with $skip and $limit

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    • Type: Bug
    • Resolution: Works as Designed
    • Priority: Major - P3
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    • Affects Version/s: None
    • Component/s: None
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    • Query Execution
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      Run the following queries and see the results:
      Query 1:
      -----------------------------

      [
  {
    $match:
{       "Data.general.assessmentId":         "08dd7293497b6bb7eabd888a",       "Data.general.status": "Certified"     }
  },
  {
    $sort:
{       UpdatedOn: -1     }
  },
 
{     $skip: 0   }
,
 
{     $limit: 25   }
,
  {
     $match:
{        "Data.general.userId":          "08dd08654ab95f1b27e45226"      }
  }
]

       

      Query 2:
      -----------------------------

      [
  {
    $match:
{       "Data.general.assessmentId":         "08dd7293497b6bb7eabd888a",       "Data.general.status": "Certified"     }
  },
  {
    $sort:
{       UpdatedOn: -1     }
  },
 
{     $skip: 25   }
,
 
{     $limit: 25   }
,
  {
     $match:
{        "Data.general.userId":          "08dd08654ab95f1b27e45226"      }
  }
]

       

      Show
      Run the following queries and see the results: Query 1: ----------------------------- [   {     $match: {       "Data.general.assessmentId" :         "08dd7293497b6bb7eabd888a" ,       "Data.general.status" : "Certified"     }   },   {     $sort: {       UpdatedOn: -1     }   },   {     $skip: 0   } ,   {     $limit: 25   } ,   {      $match: {         "Data.general.userId" :           "08dd08654ab95f1b27e45226"      }   } ]   Query 2: ----------------------------- [   {     $match: {       "Data.general.assessmentId" :         "08dd7293497b6bb7eabd888a" ,       "Data.general.status" : "Certified"     }   },   {     $sort: {       UpdatedOn: -1     }   },   {     $skip: 25   } ,   {     $limit: 25   } ,   {      $match: {         "Data.general.userId" :           "08dd08654ab95f1b27e45226"      }   } ]  
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      When using the aggregation pipeline, the $skip stage does not correctly exclude documents based on the subsequent $match criteria. Even when specifying a valid skip value, documents with Data.general.userId set to 08dd08654ab95f1b27e45226 are still returned in the results. Sample document is attached, please investigate this issue.

        1. image-2025-04-24-10-20-40-517.png
          image-2025-04-24-10-20-40-517.png
          8 kB
        2. sahi-quiz.AssessmentStudent.json
          31.59 MB

            Assignee:
            Mihai Andrei
            Reporter:
            alex SL
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              Created:
              Updated:
              Resolved: