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Posted to dev@lucene.apache.org by "Alan Woodward (JIRA)" <ji...@apache.org> on 2017/11/01 14:02:00 UTC
[jira] [Updated] (LUCENE-8017) FunctionRangeQuery and
FunctionMatchQuery can pollute the QueryCache
[ https://issues.apache.org/jira/browse/LUCENE-8017?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Alan Woodward updated LUCENE-8017:
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Attachment: LUCENE-8017.patch
Here's a patch adding getCacheHelper() as a method on Weight. I've made this abstract and implemented it on all Weights - it could theoretically default to returning null or the Reader-level cache helper, but I think it's better to be explicit about it.
Some things to explore in follow-up issues:
* re-instate getCoreAndDeletesCacheHelper (or CoreAndDocValues, or whatever we want to call it) so that doc-values based queries can be re-used between searchers if the DV gen is the same
* add getCacheHelper to Double/LongValuesSource so that, eg constant DVS queries can be cached properly
> FunctionRangeQuery and FunctionMatchQuery can pollute the QueryCache
> --------------------------------------------------------------------
>
> Key: LUCENE-8017
> URL: https://issues.apache.org/jira/browse/LUCENE-8017
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Alan Woodward
> Assignee: Alan Woodward
> Priority: Major
> Attachments: LUCENE-8017.patch
>
>
> The QueryCache assumes that queries will return the same set of documents when run over the same segment, independent of all other segments held by the parent IndexSearcher. However, both FunctionRangeQuery and FunctionMatchQuery can select hits based on score, which depend on term statistics over the whole index, and could therefore theoretically return different result sets on a given segment.
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