Understanding JCR Query search results
When you query the JCR repository using SQL2/Query Builder/XPath query, lucene handles the query in the backend. It orders the query based on a score it calculates. You can print the score using this code snippet
QueryManager qm = jcrSession.getWorkspace().getQueryManager();
String queryString = “SELECT * FROM [cq:PageContent] WHERE ” …..” ;
Query query = qm.createQuery(queryString, Query.JCR_SQL2);
// execute query
QueryResult result = query.execute();
// get column names
String columnNames = result.getColumnNames();
// get column rows
RowIterator rowIterator = result.getRows();
// get next row
Row row = rowIterator.nextRow();
// get all values of row
Value values = row.getValues();
//print the values. One of the values is jcr_score
The Score is calculated using pretty complex mathematical formula. You can read more about it at http://lucene.apache.org/core/3_6_2/api…ilarity.html
Some more explanation is provided at http://www.lucenetutorial.com/advanced-t…oring.html
Here are some main points:
- The length of document is number of terms not number of characters
- The relationship between frequency and length is not linear. It is sqrt(frequency/total terms in document)
- If your search has more than one term and one of the terms is a common term in the repository, then that common word gets less weightage. For e.g. if your content is for the company Polycom, then term like ‘conference might be a common term. So, when you search for ‘VOIP Conference’, then ‘conference’ would get lower weightage.
If you would like more help optimizing or managing your JCR Query, Contact Us Today.
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