LUCENE-6513: Add FrequentTermsSpanBooleanQueryRewrite - #16484
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…mQueryWrapper Adds a SpanRewriteMethod that bounds SpanMultiTermQueryWrapper expansion by retaining only the most frequent terms, ranked by document frequency (DF_ORDER) or document frequency then total term frequency (DF_THEN_TTF_ORDER), or any caller-supplied Comparator<ScoreTerm>. This offers a more meaningful cap than TopTermsSpanBooleanQueryRewrite, whose boost-based ordering degenerates to lexicographical order for most multi-term queries. It is built on ScoringRewrite rather than TopTermsRewrite because TopTermsRewrite caps terms while collecting them per segment, which requires a ranking key that is stable across segments (such as boost); document and total term frequencies are only per-segment during collection. ScoringRewrite instead collects every matching term first, aggregating TermStates across all segments, after which the maxSize most frequent terms are kept in a PriorityQueue using the aggregated statistics. Implements equals/hashCode over maxSize and the ordering Comparator for parity with TopTermsSpanBooleanQueryRewrite. Adds TestSpanMultiTermQueryWrapper.testFrequentTermsRewrite covering the frequency-based cap.
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-- to SpanMultiTermQueryWrapper
See #7571
Adds a SpanRewriteMethod that bounds SpanMultiTermQueryWrapper expansion by retaining only the most frequent terms, ranked by document frequency (DF_ORDER) or document frequency then total term frequency (DF_THEN_TTF_ORDER), or any caller-supplied Comparator. This offers a more meaningful cap than TopTermsSpanBooleanQueryRewrite, whose boost-based ordering degenerates to lexicographical order for most multi-term queries.
It is built on ScoringRewrite rather than TopTermsRewrite because TopTermsRewrite caps terms while collecting them per segment, which requires a ranking key that is stable across segments (such as boost); document and total term frequencies are only per-segment during collection. ScoringRewrite instead collects every matching term first, aggregating TermStates across all segments, after which the maxSize most frequent terms are kept in a PriorityQueue using the aggregated statistics.
Implements equals/hashCode over maxSize and the ordering Comparator for parity with TopTermsSpanBooleanQueryRewrite. Adds TestSpanMultiTermQueryWrapper.testFrequentTermsRewrite covering the frequency-based cap.