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From "Paul Elschot (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1278) Add optional storing of document numbers in term dictionary
Date Mon, 05 May 2008 10:10:57 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12594206#action_12594206
] 

Paul Elschot commented on LUCENE-1278:
--------------------------------------

Would there be any performance measurements for this? It might be quite good for terms that
occur in very many documents, an area in which some improvement is possible I think.
Btw, for this case it might also be good to use a SortedVIntList instead of an IntArrayList.

I had a look at today's patch, but I stopped at DocumentsWriter because it contains a lot
of layout changes, so it's hard to focus on the functional differences.

Are there any index format changes involved in this?

> Add optional storing of document numbers in term dictionary
> -----------------------------------------------------------
>
>                 Key: LUCENE-1278
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1278
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Index
>    Affects Versions: 2.3.1
>            Reporter: Jason Rutherglen
>            Priority: Minor
>         Attachments: lucene.1278.5.4.2008.patch, lucene.1278.5.5.2008.patch
>
>
> Add optional storing of document numbers in term dictionary.  String index field cache
and range filter creation will be faster.  
> Example read code:
> {noformat}
> TermEnum termEnum = indexReader.terms(TermEnum.LOAD_DOCS);
> do {
>   Term term = termEnum.term();
>   if (term == null || term.field() != field) break;
>   int[] docs = termEnum.docs();
> } while (termEnum.next());
> {noformat}
> Example write code:
> {noformat}
> Document document = new Document();
> document.add(new Field("tag", "dog", Field.Store.YES, Field.Index.UN_TOKENIZED, Field.Term.STORE_DOCS));
> indexWriter.addDocument(document);
> {noformat}

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