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https://issues.apache.org/jira/browse/LUCENE-3325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13066631#comment-13066631
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Paul Elschot commented on LUCENE-3325:
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Perhaps this also speeds up segment merging, as there is no more need to
uninvert the positions.
> Transpose positions in index
> ----------------------------
>
> Key: LUCENE-3325
> URL: https://issues.apache.org/jira/browse/LUCENE-3325
> Project: Lucene - Java
> Issue Type: Wish
> Components: core/index
> Reporter: Paul Elschot
> Priority: Minor
>
> When positions are used in queries with many terms, each term in each
> document causes a seek in the positions, and in large indexes these seeks can
> be far apart even when the terms are in the same document.
> The number of (disk) cache misses of such position seeks might be reduced by
> putting the positions for all terms in the same document directly behind each
> other. This should have a noticable effect when terms are alphabetically
> close, for example for truncations, and it should also help when the
> documents have few enough positions to fill a cache entry (disk page, cache
> line).
> This might also help the performance of highlighting based on indexed
> positions.
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