[SBE] Add support for the COUNT_SCAN stage to the SBE stage builders

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    • Query Execution
    • Fully Compatible
    • QE 2023-05-15, QE 2023-05-29, QE 2023-06-12
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      When I tried to run the "bestbuy_agg_query_comparison.js" benchmark (from https://github.com/10gen/workloads) with useAgg=true and with SBE mode enabled, the benchmark failed with an error message saying "Can't build exec tree for node: COUNT".

      I've created a simple example that reproduces the failure:

      > db.adminCommand({setParameter:1, internalQueryEnableSlotBasedExecutionEngine:true});
> db.c.insert({a: 1})
> db.c.createIndex({a: 1})
> db.c.aggregate([{$match: {a: 1}}, {$count: "count"}]).itcount();

      The goal of this task is to implement support for the COUNT stage so that these kinds of queries work correctly when SBE mode is enabled.

            Assignee:
            Zixuan Zhuang
            Reporter:
            Drew Paroski
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              Created:
              Updated:
              Resolved: