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https://issues.apache.org/jira/browse/LUCENE-4516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13487766#comment-13487766
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Simon Willnauer commented on LUCENE-4516:
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I agree with robert that this is maybe tailored. In general I think with the
ideas in LUCENE-4491 we can make a good step forward to this and maybe enable
it in a specialized suggester.
> Suggesters: allow to associate a user-specified key (int) with a string
> -----------------------------------------------------------------------
>
> Key: LUCENE-4516
> URL: https://issues.apache.org/jira/browse/LUCENE-4516
> Project: Lucene - Core
> Issue Type: New Feature
> Components: core/FSTs
> Reporter: Oliver Christ
> Priority: Minor
>
> As a user, I'd like to associate a “foreign key” with a string (rather: final
> node) in the suggester index (in addition to the rank). For example, I’d like
> to add “Lucene in Action” with key 1933988177 (the ISBN) and some rank to a
> WFST or AnalyzingSuggester. A completion would return the completed string
> and the key associated with each entry (i.e. final nodes get a “key” field
> (int), which is returned in the LookupResult). That foreign key could also be
> used for fast de-duping (no more string/byte array comparisons).
> There may be workarounds for the “foreign key” use case –it seems that lots
> of data structures would be affected by storing a user-provided key with
> final nodes, which therefore may not be a viable path. It may be possible to
> encode the foreign key in the transducer’s output instead.
> *Discussion on java-user@lucene:*
> Mike McCandless:
> This is maybe the same idea as
> LUCENE-4491 ? Could you simply stuff your ISBN onto the end of the
> suggestion (ie enroll Lucene in
> Action|1933988177)?
> Dawid Weiss:
> Just remember that if your suffixes are unique then you'll be expanding the
> automaton quite a bit (unique suffix paths).
> D.
> Mike:
> That's a good point... encoding into the FST's output may be better.
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