ian.boros@mongodb.com observed that at https://github.com/mongodb/mongo/blob/aaddbc893195ddd4443d9e8896c0627b28bbb9ff/src/mongo/db/catalog/column_index_consistency.cpp#L121-L146 we seek against CSI twice, which can probably be avoided.

Simplifying this to a single round of seeks would result in better performance and the code would likely be easier to follow.