Consider the query ( p a b c d e f g ). If the index under a returns only one or two keys, then…

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Consider the query ( p a b c d e f g ). If the index under a returns only one or two keys, then it is probably a waste of time for dtree- fetch to consider the other keys in the hope of finding a smaller bucket. It is certainly a waste if there are no keys at all indexed under a. Make appropriate changes to dtree-fetch.