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  1. Core Server
  2. SERVER-83085

Enforce consistent upsert semantics

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    • Type: Icon: Bug Bug
    • Resolution: Unresolved
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: None
    • Component/s: None
    • Query Optimization
    • ALL
    • Hide 
       MongoDB Enterprise > db.runCommand({
update: "coll",
updates: [{
multi: true,
upsert: true,
q: {
$nor: [{
$or: [
{ "x": 1 }
,
{ "y": 2 }
]
}, {
"x":
{ $ne: 3 }
}]
},
u: [ { "$unset" : "z" } ]
}]
})
{
"n" : 1,
"upserted" : [
{ "index": 0, "_id": ObjectId("654d421587d21e4fb0f54e2e") }
],
"nModified" : 0,
"ok" : 1
}
MongoDB Enterprise > db.coll.find()
{ "_id" : ObjectId("654d421587d21e4fb0f54e2e"), "x" : 3 }

       

      Show
      MongoDB Enterprise > db.runCommand({ update: "coll" , updates: [{ multi: true , upsert: true , q: { $nor: [{ $or: [ { "x" : 1 } , { "y" : 2 } ] }, { "x" : { $ne: 3 } }] }, u: [ { "$unset" : "z" } ] }] }) { "n" : 1, "upserted" : [ { "index" : 0, "_id" : ObjectId( "654d421587d21e4fb0f54e2e" ) } ], "nModified" : 0, "ok" : 1 } MongoDB Enterprise > db.coll.find() { "_id" : ObjectId( "654d421587d21e4fb0f54e2e" ), "x" : 3 }  
    • QO 2024-02-05

      I ran into this while adding upsert support to the update fuzzer during skunkworks (TIG-4521). This appears to be caused by SERVER-81630 - I noticed different behavior after it than before it. Before the change, an upsert with a query like this:

      {$nor: [{$or: [{x: 1}, {y: 2}]}, {x: {$ne: 3}}]}

      would insert an empty document (that is, empty aside from _id). After the change, it inserts a document with _id and a field from the $nor predicate (x: 3). This predicate with a $ne and $or nested in a $nor was the simplest one I could find to trigger the differing behavior.

            Assignee:
            steve.tarzia@mongodb.com Steve Tarzia
            Reporter:
            alyssa.clark@mongodb.com Alyssa Clark
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              Created:
              Updated: