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joewiz/index-backed-distinct-values.xq

Last active July 11, 2017 16:34
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Get distinct values, using range indexes in eXist-db
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index-backed-distinct-values.xq
xquery version "3.1";
(: In eXist-db, distinct-values() is not backed by range indexes.
To achieve better performance for this operation, use util:index-keys.
This sample retrieves all distinct indexed values for the @ref attribute. :)
util:index-keys(collection("/db/apps/my-app/data")//@ref, (),
    function($key, $count) {
        $key
    }, -1, "range-index")
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