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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