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From Erick Erickson <erickerick...@gmail.com>
Subject Re: Using term offsets for hit highlighting
Date Tue, 20 Mar 2012 11:34:00 GMT
Yep, the first challenge is always getting the old patch(es) to apply.....

On Tue, Mar 20, 2012 at 4:09 AM, Alan Woodward
<alan.woodward@romseysoftware.co.uk> wrote:
> Thanks for all the offers of help!  It looks as though most of the hard work has already
been done, which is exactly where I like to pick up projects.  :-)
>
> Maybe the best place to start would be for me to rebase the branch against trunk, and
see what still fits?  I think there have been some fairly major changes in the internals
since July last year.
>
> On 19 Mar 2012, at 17:07, Mike Sokolov wrote:
>
>> I posted a patch with a Collector somewhat similar to what you described, Alan -
it's attached to one of the sub-issues https://issues.apache.org/jira/browse/LUCENE-3318.
  It is in a fairly complete "alpha" state, but has seen no production use of course, since
it relies on the remainder of the unfinished work in that branch.  It works by creating a
TokenStream based on match positions returned from the query and passing that to the existing
Highlighter.  Please feel free to get in touch if you decide to look into that and have questions.
>>
>>
>> -Mike
>>
>> On 03/19/2012 11:51 AM, Simon Willnauer wrote:
>>> On Mon, Mar 19, 2012 at 4:50 PM, Uwe Schindler<uwe@thetaphi.de>  wrote:
>>>
>>>> Have you marked that for GSOC? Would be a good idea!
>>>>
>>>  yes I did
>>>
>>>> -----
>>>> Uwe Schindler
>>>> H.-H.-Meier-Allee 63, D-28213 Bremen
>>>> http://www.thetaphi.de
>>>> eMail: uwe@thetaphi.de
>>>>
>>>>
>>>>
>>>>> -----Original Message-----
>>>>> From: Simon Willnauer [mailto:simon.willnauer@googlemail.com]
>>>>> Sent: Monday, March 19, 2012 4:43 PM
>>>>> To: dev@lucene.apache.org
>>>>> Subject: Re: Using term offsets for hit highlighting
>>>>>
>>>>> Alan, you made my day!
>>>>>
>>>>> The branch is kind of outdated but I looked at it lately and I can certainly
help
>>>>> to get it up to speed. The feature in that branch is quite a big one
and its in a
>>>>> very early stage. Still I want to encourage you to take a look and work
on it. I
>>>>> promise all my help with the issues!
>>>>>
>>>>> let me know if you have questions!
>>>>>
>>>>> simon
>>>>>
>>>>> On Mon, Mar 19, 2012 at 3:52 PM, Alan Woodward
>>>>> <alan.woodward@romseysoftware.co.uk>  wrote:
>>>>>
>>>>>> Cool, thanks Robert.  I'll take a look at the JIRA ticket.
>>>>>>
>>>>>> On 19 Mar 2012, at 14:44, Robert Muir wrote:
>>>>>>
>>>>>>
>>>>>>> On Mon, Mar 19, 2012 at 10:38 AM, Alan Woodward
>>>>>>> <alan.woodward@romseysoftware.co.uk>  wrote:
>>>>>>>
>>>>>>>> Hello,
>>>>>>>>
>>>>>>>> The project I'm currently working on requires the reporting
of exact
>>>>>>>> hit positions from some pretty hairy queries, not all of
which are
>>>>>>>> covered by the existing highlighter modules.  I'm working
round this
>>>>>>>> by translating everything into SpanQueries, and using the
getSpans()
>>>>>>>> method to locate hits (I've extended the Spans interface
to make
>>>>>>>> term offsets available - see
>>>>>>>> https://issues.apache.org/jira/browse/LUCENE-3826).  This
works for
>>>>>>>> our use-case, but isn't terribly efficient, and obviously
isn't applicable to
>>>>>>>>
>>>>> non-Span queries.
>>>>>
>>>>>>>> I've seen a bit of chatter on the list about using term offsets
to
>>>>>>>> provide accurate highlighting in Lucene.  I'm going to have
a couple
>>>>>>>> of weeks free in April, and I thought I might have a go at
>>>>>>>> implementing this.  Mainly I'm wondering if there's already
been
>>>>>>>> thoughts about how to do it.  My current thoughts are to
somehow
>>>>>>>> extend the Weight and Scorer interface to make term offsets
>>>>>>>> available; to get highlights for a given set of documents,
you'd
>>>>>>>> essentially run the query again, with a filter on just the
documents
>>>>>>>> you want highlighted, and have a custom collector that gets
the term
>>>>>>>>
>>>>> offsets in place of the scores.
>>>>>
>>>>>>>>
>>>>>>> Hi Alan, Simon started some initial work on
>>>>>>> https://issues.apache.org/jira/browse/LUCENE-2878
>>>>>>>
>>>>>>> Some work and prototypes were done in a branch, but it might
be
>>>>>>> lagging behind trunk a bit.
>>>>>>>
>>>>>>> Additionally at the time it was first done, I think we didn't
yet
>>>>>>> support offsets in the postings lists.
>>>>>>> We've since added this and several codecs support it.
>>>>>>>
>>>>>>> --
>>>>>>> lucidimagination.com
>>>>>>>
>>>>>>> ---------------------------------------------------------------------
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>>>>>>>
>>>>>>>
>>>>>>
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>>>>>>
>>>>>>
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>>>>>
>>>>
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>>>
>>
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>
>
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