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https://issues.apache.org/jira/browse/SOLR-13289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17097678#comment-17097678
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Mike Drob commented on SOLR-13289:
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Based on my understanding, I favor the boolean approach.
The only knob we have is a threshold, not an error bound, right? As in, if
there are more than X results, it's ok to return an estimate that may be too
low. We don't get to specify that we need the estimate to be within 10% or 1%
or whatever of the actual result, which is what precision would imply.
I like [~sokolov]'s comment about {{hitCountExact}}, that makes sense to me,
but there's lots of options here.
Specific comments left on the PR.
> 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: 1h 20m
> 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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