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https://issues.apache.org/jira/browse/SOLR-13289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17100516#comment-17100516
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Adrien Grand commented on SOLR-13289:
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bq. TwoPhaseIterator
LUCENE-8806 explores supporting two-phase iterators with block-max WAND.
bq. more signals for calculating the score
We have been recommending using FeatureField for this use-case:
https://lucene.apache.org/core/8_5_0/core/org/apache/lucene/document/FeatureField.html.
It encode float values as term freqs to be able to work with block-max WAND.
bq. If you just need a custom similarity that uses TF/IDF, then you should be
able to use it.
Indeed, we only require that scores do not decrease when tf increases and do
not increase when norm decreases.
> Support for BlockMax WAND
> -------------------------
>
> Key: SOLR-13289
> URL: https://issues.apache.org/jira/browse/SOLR-13289
> Project: Solr
> Issue Type: New Feature
> Reporter: Ishan Chattopadhyaya
> Assignee: Tomas Eduardo Fernandez Lobbe
> Priority: Major
> Attachments: SOLR-13289.patch, SOLR-13289.patch
>
> Time Spent: 3h
> Remaining Estimate: 0h
>
> LUCENE-8135 introduced BlockMax WAND as a major speed improvement. Need to
> expose this via Solr. When enabled, the numFound returned will not be exact.
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