Executing Collector's Collect method on more than one thread

[adfel70]

I am using RankQuery to implement my applicative scorer that returns a score
based on the value of specific field (lets call it 'score_field') that is
stored for every document. 
The RankQuery creates a collector, and for every collected docId I retrieve
the value of score_field, calculate the score and add the doc id into
priority queue: 

public class MyScorerrankQuery extends RankQuery { 
        ... 

        @Override 
        public TopDocsCollector getTopDocsCollector(int i,
SolrIndexerSearcher.QueryCommand cmd, IndexSearcher searcher) { 
                ... 
                return new MyCollector(...) 
        } 
} 

public class MyCollector  extends TopDocsCollector{         
        MyScorer scorer; 
        SortedDocValues scoreFieldValues;
        

        @Override 
        public void collect(int id){ 
                int docID = docBase + id; 
                        //1. get specific field from the doc using DocValues 
and calculate score
using my scorer 
                        String value = 
scoreFieldValues.get(docID).utf8ToString(); 
                        scorer.calcScore(value); 
                        //2. add docId and score (ScoreDoc object) into 
PriorityQueue. 
        } 
} 

Problem is that the calcScore may take ~20 ms per call, so if query returns
100,000 docs, which is not unusual, query execution time will be become 16
minutes. Is there a way to parallelize collector's logic, so more than one
thread would call calcScore simultaneously?



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