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[FR] Add `SUM` Functionality to AggregateQuerySnapshot

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@cherylEnkidu 已经在做这个了。

开始于 2025年3月31日。

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描述

api: firestore type: feature request
Feature proposal

Firebase Component: Firestore

Hello,
The Firestore C++ SDK currently supports only the count() method in the firebase::firestore::AggregateQuerySnapshot class but lacks a sum() method (and avg()), which is essential for aggregating numeric fields across documents.

Current State

The public functions of AggregateQuerySnapshot are:

  • count()
  • is_valid()
  • Assignment operators (operator=)
  • query()

Reference:

Flutter SDK Implications

This enhancement would also benefit the Flutter SDK, which relies on the Firestore C++ SDK for Windows platform support. For example, in the FlutterFire plugin, unsupported aggregation types like sum currently result in:

...
      case AggregateType::sum:
        std::cout << "Sum is not supported on C++" << std::endl;
        break;
...

Adding sum() to the C++ SDK would also benefit Flutter developers using Firestore on Windows.

Benefits

Implementing a sum() method would:

  1. Provide access to Firestore's aggregation capabilities in the C++ SDK.
  2. Support more use cases for C++ and Flutter developers.

Looking forward to hearing thoughts and feedback!
Thanks,

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