[LUCENE-2067] Czech Stemmer

• Type: New Feature
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 4.0-ALPHA
• Component/s: modules/analysis
• Lucene Fields: New, Patch Available
• Assignee: Robert Muir
• Reporter: Robert Muir
• Created: 14/Nov/09 10:27
• Updated: 28/Aug/22 12:14
• Resolved: 29/Nov/09 12:00

Description

Currently, the CzechAnalyzer is merely stopwords, and there isn't a czech stemmer in snowball.

This patch implements the light stemming algorithm described in: http://portal.acm.org/citation.cfm?id=1598600

In their measurements, it improves MAP 42%

The analyzer does not use this stemmer if LUCENE_VERSION <= 3.0, for back compat.