Find query fails with filter on field of a hash *in specified array element*

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    • Type: Bug
    • Resolution: Unresolved
    • Priority: Major - P3
    • None
    • Affects Version/s: None
    • Component/s: Querying
    • None
    • Environment:
      Ubuntu 16.04.6 with MongoDB 4.0.9
      MongoDB Atlas with MongoDB 4.0.10
    • Query Execution
    • ALL
    • Hide 
      db.bughunt.drop;
db.bughunt.insertOne({
 prices : [ {
 max : 250,
 min : 200
 } ]
});

var doc;

////////////////////////////////////////////////////////////////////
// Documents that we can find by using `prices.0.min` in filter;
// No bug noted here, so see "NO BUG" in print output
////////////////////////////////////////////////////////////////////

doc = db.bughunt.findOne(\{'prices.0.min' : 200 });
if (doc) {
 print ("1) NO BUG: doc found");
 print (tojson(doc));
} else {
 print ("1) BUGBUG: doc NOT found!");
}

doc = db.bughunt.findOne(\{'prices.0.min' : { $exists : true } });
if (doc) {
 print ("2) NO BUG: doc found");
 print (tojson(doc));
} else {
 print ("2) BUGBUG: doc NOT found!");
}

doc = db.bughunt.findOne(\{ 'prices.0.min' : { $gt : 100 } });
if (doc) {
 print ("3) NO BUG: doc found");
 print (tojson(doc));
} else {
 print ("3) BUGBUG: doc NOT found!");
}

doc = db.bughunt.findOne(\{ 'prices.0.min' : { $exists : true, $ne : 123 } });
if (doc) {
 print ("4) NO BUG: doc found");
 print (tojson(doc));
} else {
 print ("4) BUGBUG: doc NOT found!");
}

////////////////////////////////////////////////////////////////////
// Documents that we CANNOT find using `prices.0.min` in filter;
// BUG noted here, so see "BUGBUG" in print output
////////////////////////////////////////////////////////////////////

doc = db.bughunt.findOne(\{ 'prices.0.min' : { $exists : true, $ne : null } });
if (doc) {
 print ("5) NO BUG: doc found");
 print (tojson(doc));
} else {
 print ("5) BUGBUG: doc NOT found!");
}

doc = db.bughunt.findOne(\{ 'prices.0.min' : { $ne : null } });
if (doc) {
 print ("6) NO BUG: doc found");
 print (tojson(doc));
} else {
 print ("6) BUGBUG: doc NOT found!");
}

print ("Bughunt finished!");
      Show
      db.bughunt.drop; db.bughunt.insertOne({ prices : [ { max : 250, min : 200 } ] }); var doc; //////////////////////////////////////////////////////////////////// // Documents that we can find by using `prices.0.min` in filter; // No bug noted here, so see "NO BUG" in print output //////////////////////////////////////////////////////////////////// doc = db.bughunt.findOne(\{'prices.0.min' : 200 }); if (doc) { print ("1) NO BUG: doc found"); print (tojson(doc)); } else { print ("1) BUGBUG: doc NOT found!"); } doc = db.bughunt.findOne(\{'prices.0.min' : { $exists : true } }); if (doc) { print ("2) NO BUG: doc found"); print (tojson(doc)); } else { print ("2) BUGBUG: doc NOT found!"); } doc = db.bughunt.findOne(\{ 'prices.0.min' : { $gt : 100 } }); if (doc) { print ("3) NO BUG: doc found"); print (tojson(doc)); } else { print ("3) BUGBUG: doc NOT found!"); } doc = db.bughunt.findOne(\{ 'prices.0.min' : { $exists : true, $ne : 123 } }); if (doc) { print ("4) NO BUG: doc found"); print (tojson(doc)); } else { print ("4) BUGBUG: doc NOT found!"); } //////////////////////////////////////////////////////////////////// // Documents that we CANNOT find using `prices.0.min` in filter; // BUG noted here, so see "BUGBUG" in print output //////////////////////////////////////////////////////////////////// doc = db.bughunt.findOne(\{ 'prices.0.min' : { $exists : true, $ne : null } }); if (doc) { print ("5) NO BUG: doc found"); print (tojson(doc)); } else { print ("5) BUGBUG: doc NOT found!"); } doc = db.bughunt.findOne(\{ 'prices.0.min' : { $ne : null } }); if (doc) { print ("6) NO BUG: doc found"); print (tojson(doc)); } else { print ("6) BUGBUG: doc NOT found!"); } print ("Bughunt finished!");
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      If you have in your collection a document:

      {
    _id: ...,
    prices : [ {
        max : 250,
        min : 200
   } ]
}

      You can successfully query it by using the following filters:

      1) 

      {'prices.0.min' : 200 }

      2) 

      {'prices.0.min' : { $exists : true } }

      3) 

      { 'prices.0.min' : { $gt : 100 } }

      4) 

      { 'prices.0.min' : { $exists : true, $ne : 123 } }

      BUT you CANNOT do it using the below filters:

      1) 

      { 'prices.0.min' : { $exists : true, $ne : null } }

      2) 

      { 'prices.0.min' : { $ne : null } }

      The problem noted is with only `$ne : null` in filter.

              Assignee:
              [DO NOT USE] Backlog - Query Execution
              Reporter:
              Kelianne Mathiot
              Votes:
              0 Vote for this issue
              Watchers:
              12 Start watching this issue

                Created:
                Updated: