SERVER-77899 remove repeat contain index from the relevant candidate indexes, this can avoid some useless calculations. #1552
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… can avoid some useless calculations.
…e relevant candidate indexes
kelly-cs
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kelly-cs
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kelly-cs
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// remove repeat contain index from the relevant candidate indexes, this can avoid some useless calculations.
// for example:
// {a:1, b:1} contain {a:1}, so we can remove index {a:1} from the candidates
// {a:"hashed", b:1} contain {a:"hashed"}, so we can remove index {a:"hahsed"} from the candidates
//
// {a:1, b:1} is better than {a:1},because both cases are satisfied for db.collection.find({a:xx})
// and db.collection.find({a:xx,b:xx})
//