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https://issues.apache.org/jira/browse/LUCENE-6290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14335138#comment-14335138
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Robert Muir commented on LUCENE-6290:
-------------------------------------
I think if QWF can somehow "pass thru" appoximation support of the wrapped
query, that would be fantastic.
> 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
>
>
> 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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