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cts.rank( $arg as (String | Number | Boolean | null | Array | Object)[], $value as xs.anyAtomicType, [$options as String[]] ) as Number?
Returns the rank of a value in a data set. This function works like
math:rank
except each item in the sequence is repeated
cts:frequency
times before calculating the rank.
This function is designed to take a sequence of values returned
by a lexicon function (for example, cts:element-values
); if you
input non-lexicon values, the result will be the empty sequence.
// This query assumes an element range index of type 'int' // is configured for the 'int' element in the database. It // generates some sample data and then performs the aggregation // in a separate transaction. declareUpdate(); for (x=1; x<11; x++) { var o = new Object(); o.int = []; for (y=x; y<11; y++) { o.int.push(y); }; xdmp.documentInsert((x + ".json"), o); }; ****** // Run the following query: cts.rank(cts.values( cts.jsonPropertyReference("int", "type=int"), null, ["item-frequency"]), 9); => 37
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