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https://issues.apache.org/jira/browse/LUCENE-6421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14495449#comment-14495449
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Robert Muir commented on LUCENE-6421:
-------------------------------------
The bug was silly. MultiPhraseWeight would 'return null' if one term didn't
exist in the segment, but that code is dead (we just ignore it and check if the
list of postings is empty at the end).
I also added some unit tests for the postings enum (which didnt have bugs, but
still good to have direct tests).
> Add two-phase support to MultiPhraseQuery
> -----------------------------------------
>
> Key: LUCENE-6421
> URL: https://issues.apache.org/jira/browse/LUCENE-6421
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Fix For: Trunk, 5.2
>
> Attachments: LUCENE-6421.patch, LUCENE-6421_luceneutil.patch
>
>
> Two-phase support currently works for both sloppy and exact Scorers but it
> does not work if you have multiple terms at the same position
> (MultiPhraseQuery).
> This is because UnionPostingsEnum.nextDoc() aggressively reads and merges all
> the positions. Even making this initialization lazy might just be enough?
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