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https://issues.apache.org/jira/browse/LUCENE-6308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14386902#comment-14386902
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Adrien Grand commented on LUCENE-6308:
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[~dsmiley] You are right that spans should propagate two-phase approximations
so that they can be used when intersected with another query (eg. a boolean
FILTER clause). I believe LUCENE-6373 has been open for that reason, maybe we
should be more explicit about the remaining work that we need to do. As far as
I am concerned, I'm very happy to see spans becoming lazy, which was imo the
greatest challenge to get two-phase iteration working on spans.
> Spans to extend DocIdSetIterator; was: SpansEnum, deprecate Spans
> -----------------------------------------------------------------
>
> Key: LUCENE-6308
> URL: https://issues.apache.org/jira/browse/LUCENE-6308
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/search
> Affects Versions: Trunk
> Reporter: Paul Elschot
> Priority: Minor
> Attachments: LUCENE-6308-changeapi.patch,
> LUCENE-6308-changeapi.patch, LUCENE-6308-changeapi.patch,
> LUCENE-6308-changeapi.patch, LUCENE-6308-changeapi.patch,
> LUCENE-6308-changeapi.patch, LUCENE-6308.patch, LUCENE-6308.patch,
> LUCENE-6308.patch, LUCENE-6308.patch, LUCENE-6308.patch, LUCENE-6308.patch
>
>
> An alternative for Spans that looks more like PositionsEnum and adds two
> phase doc id iteration
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