Null values returned on combination of "count" and sum on aggregate query for child nodes

Issues GraphQL
, ,
1

Report a Dgraph Bug

When doing a aggregate query on child nodes (Max/Min/Sum, null values are returned when adding “count”

What version of Dgraph are you using?

21.3.0-slash 
$ dgraph version
 
Dgraph version   : v21.03.0-63-g8b9e92314
Dgraph codename  : rocket
Dgraph SHA-256   : 0f3b429d3a8d478e215fad5f28acbccb1ab4b10de62ae9a914675bcc555fc3b6
Commit SHA-1     : 8b9e92314
Commit timestamp : 2021-06-28 14:33:43 +0530
Branch           : release/v21.03-slash
Go version       : go1.16.2
jemalloc enabled : true

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Licensed variously under the Apache Public License 2.0 and Dgraph Community License.
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Have you tried reproducing the issue with the latest release?

Yes

What is the hardware spec (RAM, OS)?

16 GB RAM, Ubuntu Linux

Steps to reproduce the issue (command/config used to run Dgraph).

First issuing a query without “count”:

{
  getCompany(id: "585a72e3ca6e02010016dd57") {
    licensesAggregate(filter: {
      currency: {
        allofterms: "USD"
      }
    }) {
      priceSum
      numberMax
    }
  }
}

Resulting in good values:

{
  "data": {
    "getCompany": {
      "licensesAggregate": {
        "priceSum": 2691,
        "numberMax": 6052
      }
    }
  }
}

No adding the “count” to the child node aggregate “licensesAggregate”:

{
  getCompany(id: "585a72e3ca6e02010016dd57") {
    licensesAggregate(filter: {
      currency: {
        allofterms: "USD"
      }
    }) {
      priceSum
      numberMax
      count
    }
  }
}

This gives back null values for the aggregates that are not count:

{
  "data": {
    "getCompany": {
      "licensesAggregate": {
        "priceSum": null,
        "numberMax": null,
        "count": 78
      }
    }
  }
}

Expected behaviour and actual result.

In this case: the “priceSum” and “numberMax” not to be null

1 Like
3

I’m also running into this on 21.03.2

Dgraph version   : v21.03.2
Dgraph codename  : rocket-2
Dgraph SHA-256   : 00a53ef6d874e376d5a53740341be9b822ef1721a4980e6e2fcb60986b3abfbf
Commit SHA-1     : b17395d33
Commit timestamp : 2021-08-26 01:11:38 -0700
Branch           : HEAD
Go version       : go1.16.2
jemalloc enabled : true

ETA:

As a workaround, you can split the aggregates (I’m assuming this doubles the runtime of the aggregation):

    licensesAggregate(filter: { ... }) {
      priceSum
    }
      
    licensesCount: licensesAggregate(filter: { ... }) {
      count
    }
1 Like