[LUCENE-89] Fuzzy searches are case sensitive

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 1.2
• Component/s: core/search

Environment

Operating System: other
Platform: All

• Bugzilla Id: 18014
• Assignee: Lucene Developers
• Reporter: Cormac Twomey
• Created: 15/Mar/03 04:13
• Updated: 28/Aug/22 11:12
• Resolved: 27/May/06 01:36

Description

I've found that fuzzy search terms are case sensitive. For example, "Adagio" is calculated as having a levenshtein distance of 1 from "adagio". Of course, "ADAGIO" has a distance of 6, and would not get returned as a search result if searching for 'adagio~'.

the patch is trivial and I have it here:

• • • lucene-1.2\src\java\org\apache\lucene\search\FuzzyTermEnum.java Sun Jun 09 13:47:54 2002
    • patched\src\java\org\apache\lucene\search\FuzzyTermEnum.java Fri Mar 14 11:37:20 2003
      ***************
    • 77,83 ****
      super(reader, term);
      searchTerm = term;
      field = searchTerm.field();
      ! text = searchTerm.text();
      textlen = text.length();
      setEnum(reader.terms(new Term(searchTerm.field(), "")));
      }
    • 77,83 ----
      super(reader, term);
      searchTerm = term;
      field = searchTerm.field();
      ! text = searchTerm.text().toLowerCase();
      textlen = text.length();
      setEnum(reader.terms(new Term(searchTerm.field(), "")));
      }
      ***************
    • 88,94 ****
      */
      final protected boolean termCompare(Term term) {
      if (field == term.field()) {
      ! String target = term.text();
      int targetlen = target.length();
      int dist = editDistance(text, target, textlen, targetlen);
      distance = 1 - ((double)dist / (double)Math.min(textlen, targetlen));
    • 88,94 ----
      */
      final protected boolean termCompare(Term term) {
      if (field == term.field()) {
      ! String target = term.text().toLowerCase();
      int targetlen = target.length();
      int dist = editDistance(text, target, textlen, targetlen);
      distance = 1 - ((double)dist / (double)Math.min(textlen, targetlen));