Make a DocumentSource which supports an iterator concept

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    • Type: Improvement
    • Resolution: Unresolved
    • Priority: Major - P3
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    • Affects Version/s: None
    • Component/s: None
    • Query Integration
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      Inspired by SERVER-97356. We have the ability to return a batch of documents to feed a pipeline, and even to do so with a callback. We should extend this ability to allow a callback function to provide results in a stream. Something like this:

      class InputDataStream {
          virtual DocumentSource::GetNextResult getNext() = 0;
      };
      
      // allow constructing a DocumentSourceQueue with some implementation of the above.
      

      Conceptually, this might allow us to revert some pieces of SERVER-97356. We could re-implement new queue-like stages as a $queue, and keep all the special cases for $queue. I'm not sure it's worth changing the name back, but I like this design better.

              Assignee:
              Unassigned
              Reporter:
              Charlie Swanson
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                Created:
                Updated: