[jira] [Created] (LUCENE-10539) return a stream of completions from FSTCompletion

["Dawid Weiss (Jira)" <ji...@apache.org>]

Dawid Weiss created LUCENE-10539:
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             Summary: 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


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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