collection($mycollection)/myelem[.//myA[@myattr="myval"]//myB="val"]vscollection($mycollection)[./myelem//myA[@myattr="myval"]//myB="val"] The first iteration performs markedly better than the second.The second attempts to filter a million + fragments. xdmp:query-trace shows only two constraints on the second iteration, namely fn:collection, when gathering constraints.
Any insight appreciated on why so different.
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