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From "Simon Willnauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4518) Suggesters: highlighting (explicit markup of user-typed portions vs. generated portions in a suggestion)
Date Wed, 31 Oct 2012 12:53:34 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13487730#comment-13487730
] 

Simon Willnauer commented on LUCENE-4518:
-----------------------------------------

I tend to agree with Oliver. I have done similar things because the frontend lacks information
here. I agree its non-trivial but we should provide it if we can. For absolute correctness
you likely need to reanalyze and intersect with the automaton :/
                
> Suggesters: highlighting (explicit markup of user-typed portions vs. generated portions
in a suggestion)
> --------------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-4518
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4518
>             Project: Lucene - Core
>          Issue Type: New Feature
>            Reporter: Oliver Christ
>
> As a user, I would like the lookup result of the suggestion engine to contain information
which allows me to distinguish the user-entered portion from the autocompleted portion of
a suggestion. That information can then be used for e.g. highlighting. 
> *Notes:*
> It's trivial if the suggestion engine only applies simple prefix search, as then the
user-typed prefix is always a true prefix of the completion. However, it's non-trivial as
soon as you use an AnalyzingSuggester, where the completion may (in extreme cases) be quite
different from the user-provided input. As soon as case/diacritics folding, script adaptation
(kanji/hiragana) come into play, the completion is no longer guaranteed to be an extension
of the query. Since the caller of the suggestion engine (UI) generally does not know the implementation
details, the required information needs to be passed in the LookupResult.
> *Discussion on java-user:*
> > I haven't found a simple solution for the highlighting yet,
> > particularly when using AnalyzingSuggester (where it's non-trivial).
> Mike McCandless:
> Ahh I see ... it is challenging in that case.  Hmm.  Maybe open an issue for this as
well, so we can discuss/iterate?

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