Alan Woodward created LUCENE-6473:
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Summary: Make Spans an interface
Key: LUCENE-6473
URL: https://issues.apache.org/jira/browse/LUCENE-6473
Project: Lucene - Core
Issue Type: Improvement
Reporter: Alan Woodward
Spans is currently an abstract class, extending DocIdSetIterator. This
restricts what we can do with implementations of Spans. For example, in
LUCENE-6371, it would be useful to have PayloadSpan classes that extend
existing Spans implementations, but that also implement a PayloadSpans
interface that extends Spans. This isn't possible if Spans is not an interface
itself.
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