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https://issues.apache.org/jira/browse/LUCENE-2765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12932920#action_12932920
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Robert Muir commented on LUCENE-2765:
-------------------------------------
here is Mike's results on his wikipedia index (multi-segment, 5% deletions)
with the patch.
||Query||QPS base||QPS spec||Pct diff||
|"unit state"|7.94|7.84|-1.3%|
|state|36.15|35.81|-1.0%|
|spanNear([unit, state], 10, true)|4.46|4.42|-0.9%|
|spanFirst(unit, 5)|16.51|16.45|-0.4%|
|unit state|10.76|10.78|0.1%|
|unit~2.0|13.83|14.06 |1.7%|
|unit~1.0|14.36|14.69 |2.3%|
|uni*|15.57|16.02|2.9%|
|unit*|27.29|28.26|3.5%|
|+unit +state|11.73|12.31|4.9%|
|united~1.0|29.01|30.86|6.4%|
|un*d|66.52|70.99|6.7%|
|u*d|21.29|22.98|7.9%|
|united~2.0|6.48|7.07|9.1%|
|+nebraska +state|169.87|188.95|11.2%|
> Optimize scanning in DocsEnum
> -----------------------------
>
> Key: LUCENE-2765
> URL: https://issues.apache.org/jira/browse/LUCENE-2765
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Robert Muir
> Fix For: 4.0
>
> Attachments: LUCENE-2765.patch, LUCENE-2765.patch
>
>
> Similar to LUCENE-2761:
> when we call advance(), after skipping it scans, but this can be optimized
> better than calling nextDoc() like today
> {noformat}
> // scan for the rest:
> do {
> nextDoc();
> } while (target > doc);
> {noformat}
> in particular, the freq can be "skipVinted" and the skipDocs (deletedDocs)
> don't need to be checked during this scanning.
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