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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-6388) Optimize SpanNearQuery
Date Thu, 02 Apr 2015 06:28:53 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-6388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14392222#comment-14392222
] 

Robert Muir commented on LUCENE-6388:
-------------------------------------

{noformat}
Report after iter 10:
Chart saved to out.png... (wd: /home/rmuir/workspace/util/src/python)
                    Task   QPS trunk      StdDev   QPS patch      StdDev                Pct
diff
             MedSpanNear       75.69      (2.0%)       80.58      (3.9%)    6.5% (   0% -
  12%)
             LowSpanNear      233.30      (3.8%)      259.44      (6.5%)   11.2% (   0% -
  22%)
            HighSpanNear        9.43      (3.6%)       10.76      (7.5%)   14.0% (   2% -
  25%)
{noformat}

> Optimize SpanNearQuery
> ----------------------
>
>                 Key: LUCENE-6388
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6388
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Robert Muir
>         Attachments: LUCENE-6388.patch
>
>
> After the big spans overhaul in LUCENE-6308, we can speed up SpanNearQuery a little more:
> * SpanNearQuery defaults to collectPayloads=true, but this requires a slower implementation,
for an uncommon case. Use the faster no-payloads impl if the field doesn't actually have any
payloads.
> * Use a simple array of Spans rather than List in NearSpans classes. This is iterated
over often in the logic.



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