$avg can miss results from shards that return double values

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    • Type: Bug
    • Resolution: Done
    • Priority: Major - P3
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    • Affects Version/s: None
    • Component/s: Aggregation Framework
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      If group gets a result from a shard that returns a long value, it will set totalType to NumberLong and may fail to include previously read double values when calculating the average.

      Test (based on other unit test base classes):

                  /* Router result for a double and a long. */
            class DoubleLong : public TwoOperandBase {
                BSONObj operand1() {
                    return BSON( "d" << BSON( "subTotal" << 5.0 << "count" << 2 ) );
                }
                BSONObj operand2() {
                    return BSON( "d" << BSON( "subTotal" << 6LL << "count" << 1 ) );
                }
                BSONObj expectedResult() { return BSON( "" << 11.0/3 ); }
            };

      Actual result is 2.0 since the 5.0 value is not added to the total.

            Assignee:
            Aaron Staple (Inactive)
            Reporter:
            Aaron Staple (Inactive)
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              Created:
              Updated:
              Resolved: