[
https://issues.apache.org/jira/browse/LUCENE-9100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17000262#comment-17000262
]
Elbek Kamoliddinov commented on LUCENE-9100:
--------------------------------------------
[~h.kazuaki] We use our own dictionaries, sorry I wanted to say *note* but
managed to drop *e.* Corrected it in the description.
> JapaneseTokenizer produces inconsistent tokens
> ----------------------------------------------
>
> Key: LUCENE-9100
> URL: https://issues.apache.org/jira/browse/LUCENE-9100
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/analysis
> Affects Versions: 7.2
> Reporter: Elbek Kamoliddinov
> Priority: Major
>
> We use {{JapaneseTokenizer}} on prod and seeing some inconsistent behavior.
> With this text:
> {{"マギアリス【単版話】 4話 (Unlimited Comics)"}} I get different results if I insert
> space before `【` char. Here is the small code snippet demonstrating the case
> (note we use our own dictionary and connection costs):
> {code:java}
> Analyzer analyzer = new Analyzer() {
> @Override
> protected TokenStreamComponents createComponents(String
> fieldName) {
> // Tokenizer tokenizer = new
> JapaneseTokenizer(newAttributeFactory(), null, true,
> JapaneseTokenizer.Mode.SEARCH);
> Tokenizer tokenizer = new
> JapaneseTokenizer(newAttributeFactory(), dictionaries.systemDictionary,
> dictionaries.unknownDictionary, dictionaries.connectionCosts, null, true,
> JapaneseTokenizer.Mode.SEARCH);
> return new TokenStreamComponents(tokenizer, new
> LowerCaseFilter(tokenizer));
> }
> };
> String text1 = "マギアリス【単版話】 4話 (Unlimited Comics)";
> String text2 = "マギアリス 【単版話】 4話 (Unlimited Comics)"; //inserted space
> try (TokenStream tokens = analyzer.tokenStream("field", new
> StringReader(text1))) {
> CharTermAttribute chars =
> tokens.addAttribute(CharTermAttribute.class);
> tokens.reset();
> while (tokens.incrementToken()) {
> System.out.println(chars.toString());
> }
> tokens.end();
> } catch (IOException e) {
> // should never happen with a StringReader
> throw new RuntimeException(e);
> } {code}
> Output is:
> {code:java}
> //text1
> マギ
> アリス
> 単
> 版
> 話
> 4
> 話
> unlimited
> comics
> //text2
> マギア
> リス
> 単
> 版
> 話
> 4
> 話
> unlimited
> comics{code}
> It looks like tokenizer doesn't view the punctuation ({{【}} is
> {{Character.START_PUNCTUATION}} type) as an indicator that there should be a
> token break, and somehow 【 punctuation char causes difference in the output.
> If I use the {{JapaneseTokenizer}} tokenizer then this problem doesn't
> manifest because it doesn't tokenize {{マギアリス}} into multiple tokens and
> outputs as is.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org
For additional commands, e-mail: issues-h...@lucene.apache.org
