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cts.andNotQuery

cts.andNotQuery(
   $positive-query as cts.query,
   $negative-query as cts.query
) as cts.andNotQuery

Summary

Returns a query specifying the set difference of the matches specified by two sub-queries.

Parameters
$positive-query A positive query, specifying the search results filtered in.
$negative-query A negative query, specifying the search results to filter out.

Usage Notes

This query construct is fragment-based, so it returns true only if the specified query does not produce a match anywhere in a fragment. Therefore, a search using cts.andNotQuery is only guaranteed to be accurate if the negative query is accurate from its index resolution (that is, if the unfiltered results of the negative query are accurate. The accuracy of the index resolution depends on many factors such as the query, whether you search at a fragment root (that is, if the first parameter of cts.search specifies an XPath that resolves to a fragment root), the index options enabled on the database, the search options, and other factors. In cases where the $negative-query parameter has false positive matches, the negation of the query can miss matches (have false negative matches). In these cases, searches with cts.andNotQuery can miss results, even if those searches are filtered.

Example

cts.estimate(
  cts.andNotQuery(
    cts.wordQuery('summer'),
    cts.wordQuery('glorious')))
// .. 12 Shakespeare Plays contain some text node with the word
// 'summer' BUT NOT the word 'glorious'.

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