[LUCENE-7827] disable "textgrams" when minPrefixChars=0 AnalyzingInfixSuggester

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 7.1, 8.0
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Mikhail Khludnev
• Created: 12/May/17 20:28
• Updated: 28/Aug/22 15:15
• Resolved: 24/Aug/17 06:26

Description

The current code allows to set minPrefixChars=0, but it creates an unnecessary textgrams field, and might bring significant footprint. Bypassing it keeps existing tests green.

        if (fieldName.equals("textgrams") && minPrefixChars > 0) {
          TokenFilter filter = new EdgeNGramTokenFilter(components.getTokenStream(), 1, minPrefixChars);
          return new TokenStreamComponents(components.getTokenizer(), filter);
        } else {
          return components; // threre is no sense to go here if minPrefixChars==0 and fieldName=="textgrams"
        }

Issue Links

• is part of: LUCENE-7930 make AnalyzingInfixSuggester handy for extension