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Posted to dev@lucene.apache.org by "Adrien Grand (JIRA)" <ji...@apache.org> on 2015/02/24 19:47:04 UTC
[jira] [Updated] (LUCENE-6290) Make the query -> filter migration
less performance trappy
[ https://issues.apache.org/jira/browse/LUCENE-6290?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Adrien Grand updated LUCENE-6290:
---------------------------------
Attachment: LUCENE-6290.patch
Here is a patch:
- QueryWrapperFilter rewrites to a ConstantScoreQuery with a boost of 0 in order to propagate approximations
- FilteredQuery rewrites to a BooleanQuery when the filter is a QueryWrapperFilter in order to take advantage of approximations
> Make the query -> filter migration less performance trappy
> ----------------------------------------------------------
>
> Key: LUCENE-6290
> URL: https://issues.apache.org/jira/browse/LUCENE-6290
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Fix For: Trunk, 5.1
>
> Attachments: LUCENE-6290.patch
>
>
> The filter->query migration might be a bit trappy in terms of performance for our users.
> For instance a FilteredQuery over a TermQuery and a DocValuesRangeFilter should be migrated to a BooleanQuery with a MUST clause for the TermQuery and a FILTER clause for the DocValuesRangeQuery. Performance will be similar since in both case we would use the query to drive the iteration and the filter would only be used to check documents that match the query (we would NOT try to advance the filter iterator).
> However, if you only go half-way through the migration and end up with a FilteredQuery over a TermQuery and a QueryWrapperFilter(DocValuesRangeQuery) then performance will be terrible because this QueryWrapperFilter does not support random-access (which is the way such filters were not too slow before) and hides the approximation support from the DocValuesRangeQuery.
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