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From "Gilad Barkai (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-3390) Incorrect sort by Numeric (double) values for documents missing the sorting field
Date Mon, 22 Aug 2011 11:35:29 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-3390?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gilad Barkai updated LUCENE-3390:
---------------------------------

    Attachment: SortByDouble.java

example code

> Incorrect sort by Numeric (double) values for documents missing the sorting field
> ---------------------------------------------------------------------------------
>
>                 Key: LUCENE-3390
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3390
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: core/search
>    Affects Versions: 3.3
>            Reporter: Gilad Barkai
>            Priority: Minor
>              Labels: double, numeric, sort
>         Attachments: SortByDouble.java
>
>
> While sorting results over a numeric double field, documents which do not contain a value
for the sorting field seem to get 0 (ZERO) value in the sort. 
> This behavior is unexpected, as zero is "comparable" to the rest of the values. A better
solution would either be allowing the user to define such a "non-value" default, or always
bring those document results as the last ones.
> Example scenario:
> Adding 3 documents, 1st with value 3.5d, 2nd with -10d, and 3rd without any value.
> Searching with MatchAllDocsQuery, with sort over that field in descending order yields
the docid results of 0, 2, 1.
> Example code:
> public static void main(String[] args) throws Exception {
> 	RAMDirectory d = new RAMDirectory();
> 	IndexWriter w = new IndexWriter(d, new IndexWriterConfig(Version.LUCENE_33, new KeywordAnalyzer()));
> 	
> 	// 1st doc, value 3.5d
> 	Document doc = new Document();
> 	doc.add(new NumericField("f", Store.YES, true).setDoubleValue(3.5d));
> 	w.addDocument(doc);
> 	
> 	// 2nd doc, value of -10d
> 	doc = new Document();
> 	doc.add(new NumericField("f", Store.YES, true).setDoubleValue(-10d));
> 	w.addDocument(doc);
> 	
> 	// 3rd doc, no value at all
> 	w.addDocument(new Document());
> 	w.close();
> 	IndexSearcher s = new IndexSearcher(d);
> 	Sort sort = new Sort(new SortField("f", SortField.DOUBLE, true));
> 	TopDocs td = s.search(new MatchAllDocsQuery(), 10, sort);
> 	for (ScoreDoc sd : td.scoreDocs) {
> 		System.out.println(sd.doc + ": " + s.doc(sd.doc).get("f"));
> 	}
> 	s.close();
> 	d.close();
> }
>  

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