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  1. Core Server
  2. SERVER-19642

createIndexes command allows duplicate element names in index spec

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    • Type: Icon: Bug Bug
    • Resolution: Done
    • Priority: Icon: Major - P3 Major - P3
    • 3.3.6
    • Affects Version/s: 2.6.10, 3.0.5, 3.1.6
    • Component/s: Index Maintenance
    • Fully Compatible
    • ALL
    • Hide

      Since there is no way to create an arbitrary BSONObj to send to the server from the mongo shell, used the mgo driver to create an index spec with a duplicate element name.

      package main

import (
  "gopkg.in/mgo.v2"
  "log"
)

func main() {
  session, err := mgo.Dial("127.0.0.1:27017")
  if err != nil {
    log.Fatal(err)
  }

  err = session.DB("test").DropDatabase()
  if err != nil {
    log.Fatal(err)
  }

  coll := session.DB("test").C("coll")

  index := mgo.Index{
    Key: []string{"a", "a", "b"},
  }
  err = coll.EnsureIndex(index)
  if err != nil {
    log.Fatal(err)
  }
}
      Show
      Since there is no way to create an arbitrary BSONObj to send to the server from the mongo shell, used the mgo driver to create an index spec with a duplicate element name. package main import ( "gopkg.in/mgo.v2" "log" ) func main() { session, err := mgo.Dial("127.0.0.1:27017") if err != nil { log.Fatal(err) } err = session.DB("test").DropDatabase() if err != nil { log.Fatal(err) } coll := session.DB("test").C("coll") index := mgo.Index{ Key: []string{"a", "a", "b"}, } err = coll.EnsureIndex(index) if err != nil { log.Fatal(err) } }
    • Integrate+Tuning 14 (05/13/16)

      An index with duplicate element names in the index spec can be created:

      > db.coll.getIndexes()
[
  {
    "v" : 1,
    "key" : {
      "_id" : 1
    },
    "name" : "_id_",
    "ns" : "test.coll"
  },
  {
    "v" : 1,
    "key" : {
      "a" : 1,
      "a" : 1,
      "b" : 1
    },
    "name" : "a_1_a_1_b_1",
    "ns" : "test.coll"
  }
]

            Assignee:
            vincent.do@mongodb.com Vincent Do
            Reporter:
            max.hirschhorn@mongodb.com Max Hirschhorn
            Votes:
            1 Vote for this issue
            Watchers:
            9 Start watching this issue

              Created:
              Updated:
              Resolved: