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https://issues.apache.org/jira/browse/LUCENE-6218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14305594#comment-14305594
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Michael McCandless commented on LUCENE-6218:
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+1, awesome
> don't decode freqs or enumerate all positions, when scores are not needed
> -------------------------------------------------------------------------
>
> Key: LUCENE-6218
> URL: https://issues.apache.org/jira/browse/LUCENE-6218
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Attachments: LUCENE-6218.patch
>
>
> Today if you don't call score() some things are faster, we won't invoke
> similarity or read the norm for the document or other things.
> On the other hand, its sad in this case that we are decompressing twice as
> many packed integers as we need (freqs can be skipped over, and our postings
> lists supports that) and walking all positions in phrase matching to
> determine the number of times the phrase matched (1 is enough, then we can
> stop).
> When scoring is not needed, things can be optimized in other cases too (e.g.
> thats the whole concept of filters).
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