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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-4518) Suggesters: highlighting (explicit markup of user-typed portions vs. generated portions in a suggestion)
Date Fri, 02 Nov 2012 14:21:12 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-4518?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael McCandless updated LUCENE-4518:
---------------------------------------

    Attachment: LUCENE-4518.patch

Initial patch, that just records the starting output from when the path was added to the queue,
and uses that to set the new prefixLength in LookupResult.

Currently I only fixed WFST, Analyzing and Fuzzy suggesters to set this.  WFST will always
be correct (it's trivial), while Analyzing/Fuzzy can sometimes be too long (if there is a
common prefix to all possible completions from that starting point).
                
> 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
>         Attachments: LUCENE-4518.patch
>
>
> 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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