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Author:
{'name': 'Chi-I Huang', 'email': 'chii.huang@mongodb.com', 'username': 'chiihuang'}
Message: SERVER-80734 Sample only if all the field paths of a SargableNode are indexed
Sample only if all the field paths of a SargableNode are indexed. Otherwise, falls back to '_fallbackCE' to derive cardinality estimation. Note that:
1. If a query path is 'Get "a" Id' while an index path is 'Get "a" Traverse 1 Id', the query path will be deemed as unindexed and hence we will fall back.
2. Fix underestimated CE if there is residualReq
Branch: master
https://github.com/mongodb/mongo/commit/bac34dd6e0504d91950ceaf801b97450910dca0d
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