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https://issues.apache.org/jira/browse/LUCENE-4516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13487703#comment-13487703
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Robert Muir commented on LUCENE-4516:
-------------------------------------
I don't think we should add an option to do this, instead you would just make
your own suggester tailored to your use case?
For you it might be an int, for me maybe i have 6 long values, for another guy
2 bytes, and so on.
So I think someone should just fork one of our suggester impls and e.g. change
the Outputs impl to suit their needs.
> 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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