Currently there is no way to cover an query with $expr with an index. Even if all dependencies of $expr are provided by the index, we will still generate a FETCH stage to evaluate the $expr.
Currently QuerySolutionNode for IndexScan fully supports having a filter MatchExpression.
We should try to attach $expr to IndexScan nodes instead of generating FETCH, if it is possible.
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SERVER-41252 Enable covered query for $expr with $eq only
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- In Code Review
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- Backlog
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