[SBE] Add support for ExpressionMeta when _metaType == MetaType::kIndexKey

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    • Type: Bug
    • Resolution: Unresolved
    • Priority: Major - P3
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    • Affects Version/s: None
    • Component/s: Querying
    • Query Execution
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      > db.adminCommand({setParameter: 1, internalQueryEnableSlotBasedExecutionEngine: true});
> db.c1.createIndex({a:1});
> db.c1.find({a: 1}, {c: {$meta: 'indexKey'}});

       

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      > db.adminCommand({setParameter: 1, internalQueryEnableSlotBasedExecutionEngine: true}); > db.c1.createIndex({a:1}); > db.c1.find({a: 1}, {c: {$meta: 'indexKey'}});  
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      A simple query with an index and $meta fails.

      Right now the query from the "Steps To Reproduce" section hits an invariant failure: reqs.has(kReturnKey) || !ixn->addKeyMetadata .

      I tried fixing this invariant by calling PlanStageReqs::set() at the top level to set kReturnKey, and then I re-ran the query from the "Steps To Reproduce" section. When I did this, I got the following error message: "Expression is not supported in SBE: $meta".

      So it looks like we need to update "sbe_stage_builder_expression.cpp" so that it can handle ExpressionMeta with _metaType == MetaType::kIndexKey .

            Assignee:
            [DO NOT USE] Backlog - Query Execution
            Reporter:
            Martin Neupauer (Inactive)
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              Created:
              Updated: