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https://issues.apache.org/jira/browse/SOLR-13289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17025286#comment-17025286
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Gregg Donovan commented on SOLR-13289:
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{quote}This feature currently doesn't work in case of faceting(this is
expected), grouping.{quote}
Will WAND cause faceting to break entirely? Or will the counts for facets just
be inexact?
{quote}as same minExactHits is shared across shard. so, actual minExactHits is
shardCount*minExactHits{quote}
Perhaps it would be worth having an additional parameter for a
perShardExactHits? E.g. if we're requesting the top 1000 hits across 64 shards,
we'd likely be fine with WAND getting the top, say, 150 per shard.
> 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: Ishan Chattopadhyaya
> Priority: Major
> Attachments: SOLR-13289.patch, SOLR-13289.patch
>
>
> 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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