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https://issues.apache.org/jira/browse/LUCENE-8762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16877916#comment-16877916
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Adrien Grand commented on LUCENE-8762:
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I proposed to change the specialization for docs+freqs+positions as part of
LUCENE-8311. But it doesn't add any specialization for docs+freqs, which would
still probably be worth adding?
> Lucene50PostingsReader should specialize reading docs+freqs with impacts
> ------------------------------------------------------------------------
>
> Key: LUCENE-8762
> URL: https://issues.apache.org/jira/browse/LUCENE-8762
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
>
> Currently if you ask for impacts, we only have one implementation that is
> able to expose everything: docs, freqs, positions and offsets. In contrast,
> if you don't need impacts, we have specialization for docs+freqs,
> docs+freqs+positions and docs+freqs+positions+offsets.
> Maybe we should add specialization for the docs+freqs case with impacts,
> which should be the most common case, and remove specialization for
> docs+freqs+positions when impacts are not requested?
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