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Posted to issues@lucene.apache.org by "Dawid Weiss (Jira)" <ji...@apache.org> on 2022/04/27 08:24:00 UTC
[jira] [Commented] (LUCENE-10539) Return a stream of completions from FSTCompletion
[ https://issues.apache.org/jira/browse/LUCENE-10539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17528635#comment-17528635 ]
Dawid Weiss commented on LUCENE-10539:
--------------------------------------
PR is at: https://github.com/apache/lucene/pull/844
> Return a stream of completions from FSTCompletion
> -------------------------------------------------
>
> Key: LUCENE-10539
> URL: https://issues.apache.org/jira/browse/LUCENE-10539
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Dawid Weiss
> Assignee: Dawid Weiss
> Priority: Minor
>
> FSTLookup currently has a "num" parameter which limits the number of completions from the underlying automaton. But this has severe disadvantages if you need to collect completions that need to fulfill a secondary condition (for example, collect only verbs or terms that contain a certain infix). Then you can't determine the 'num' parameter easily because the number of filtered completions is unknown.
> I also think implementation-wise it's also much nicer to provide a stream that iterates over completions rather than a fixed-size list. This allows for much more elegant code (stream.filter, stream.limit).
> The provided patch adds a single {{Stream<Completion> lookup(key)}} method and modifies the existing lookup methods to use it.
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