Uploaded image for project: 'Core Server'
  1. Core Server
  2. SERVER-91001

SBE plan cache can pick wrong IndexScan plan

    • Type: Icon: Bug Bug
    • Resolution: Unresolved
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: 7.3.3, 8.0.0-rc6
    • Component/s: None
    • None
    • Query Execution
    • ALL

      Define a collection with this index:

      > db.repro.createIndex({
            office: 1,
            archive_status: 1,
            audit_status: 1,
            case_status: 1,
            spek_appl_submit_type_id: 1
          }) 

      Then run an aggregation where an $and clause is excluding one of the items in the $in array for the spek_appl_submit_type_id field so that the plan that gets cached is using a single interval index scan

      > db.repro.aggregate([{"$match":{"$and":[{"$and":[{"spek_appl_submit_type_id":{"$in":["1","4"]}},{"case_status":{"$in":["pending"]}},{"audit_status":{"$in":["initial"]}},{"archive_status":{"$in":["pending"]}}]},{"office":{"$in":[ObjectId("6596d6f647b62570aa1c975e")]}},{"spek_appl_submit_type_id":{"$ne":"4"}}]}},{"$count":"total"}])

      Then run the same query but replacing the "4" with a "2" so that the query now requires two index scan intervals

      >  db.repro.aggregate([{"$match":{"$and":[{"$and":[{"spek_appl_submit_type_id":{"$in":["1","2"]}},{"case_status":{"$in":["pending"]}},{"audit_status":{"$in":["initial"]}},{"archive_status":{"$in":["pending"]}}]},{"office":{"$in":[ObjectId("6596d6f647b62570aa1c975e")]}},{"spek_appl_submit_type_id":{"$ne":"4"}}]}},{"$count":"total"}])
      uncaught exception: Error: command failed: {
              "ok" : 0,
              "errmsg" : "Can only bind a single index interval",
              "code" : 6584700,
              "codeName" : "Location6584700"
      } 

       

            Assignee:
            Unassigned Unassigned
            Reporter:
            alberto.massari@mongodb.com Alberto Massari
            Votes:
            0 Vote for this issue
            Watchers:
            9 Start watching this issue

              Created:
              Updated: