Timeseries query with nested $elemMatch incorrectly uasserts

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    • Query Integration
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      const q = [
    {
        "$match": {
            "a": {
                "$elemMatch": {
                    "$elemMatch": {"$eq": 0},
                    "$eq": 0
                }
            }
        }
    },
    {"$project": {"b": "$a"}}
]
const coll = db.c;
assert(coll.drop())
assert.commandWorked(db.createCollection(coll.getName(), {timeseries: {timeField: 't', metaField: 'm'}}));
assert.commandWorked(coll.insert([
  {
    "_id" : 0,
    "t" : ISODate("1970-01-01T00:00:00Z"),
    "a" : 0,
  }
]))
coll.aggregate(q).toArray()
// Code 40352, "FieldPath cannot be constructed with empty string"
      Show
      const q = [ { "$match" : { "a" : { "$elemMatch" : { "$elemMatch" : { "$eq" : 0}, "$eq" : 0 } } } }, { "$project" : { "b" : "$a" }} ] const coll = db.c; assert (coll.drop()) assert .commandWorked(db.createCollection(coll.getName(), {timeseries: {timeField: 't' , metaField: 'm' }})); assert .commandWorked(coll.insert([ { "_id" : 0, "t" : ISODate( "1970-01-01T00:00:00Z" ), "a" : 0, } ])) coll.aggregate(q).toArray() // Code 40352, "FieldPath cannot be constructed with empty string"
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      The following query succeeds on a regular collection, but uasserts on a time-series collection.
      This query doesn't make much sense since it cannot match any documents. However for computer generated queries it's possible a user can create this

      Looks different from SERVER-99768, since that involves the bounded sorter and wildcard indexes. Though they both involve errors from FieldPath

            Assignee:
            Unassigned
            Reporter:
            Matt Boros
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              Created:
              Updated: