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https://issues.apache.org/jira/browse/LUCENE-850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12513103
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Doron Cohen commented on LUCENE-850:
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> The function query capability works for many situations, as you
> can store the various types of boosts in a FieldCache and use
> your approach. But this doesn't scale when there are tons of
> possible boost fields (which would usually be sparsely-populated).
> SparseFieldCache, anyone?
For large collections loading would indeed take long.
Quoting Michael, payloads will be more efficient for this case. Two options
actually:
- faster reading values into a cache
- value-source that feeds on the fly from payloads.
> Easily create queries that transform subquery scores arbitrarily
> ----------------------------------------------------------------
>
> Key: LUCENE-850
> URL: https://issues.apache.org/jira/browse/LUCENE-850
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Search
> Reporter: Mike Klaas
> Attachments: prodscorer.patch.diff
>
>
> Refactor DisMaxQuery into SubQuery(Query|Scorer) that admits easy
> subclassing. An example is given for multiplicatively combining scores.
> Note: patch is not clean; for demonstration purposes only.
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