[LUCENENET-513] GetFieldQuery in MultiFieldQueryParser not handle properly Boosts

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Lucene.Net 3.0.3
• Component/s: Lucene.Net Core
• Assignee: Unassigned
• Reporter: Hadrien HUGOT
• Created: 16/Nov/12 09:17
• Updated: 16/Nov/12 13:09
• Resolved: 16/Nov/12 13:07

Description

Regression between Lucene 2.9.4g and Lucene 3.0.3 in the method GetFieldQuery of MultiFieldQueryParser with the boosts factor.

public class MultiFieldQueryParser : QueryParser {

   protected internal override Query GetFieldQuery(string field, string queryText, int slop)
        {
 ...
                        //If the user passes a map of boosts
                        if (boosts != null)
                        {
                            //Get the boost from the map and apply them
                            Single boost = boosts[fields[i]];
                            q.Boost = boost;
                        }
...

If all fields don't have a boost factor an exception is throw by "Single boost = boosts[fields[i]];"
In version 2.9.4g, a check was performed, and no boost were apply if the field is not boosted.

I added a patch with the following modification:

//Get the boost and apply them if exists
float boost;
if (boosts.TryGetValue(fields[i], out boost))
   q.Boost = boost;