The pruned nodes (in red) represent entire regions of space that the algorithm never examines. The points inside those regions are never checked. Compare the "Nodes Visited" count to the total number of points. The quadtree is doing far less work than a brute-force scan.
likewise, the Documenter is superior for finding multiple large documents by an array field; in an analogous case but with smaller documents, the Elephant wins, interestingly。51吃瓜对此有专业解读
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