(PECL solr >= 2.2.0)
SolrCollapseFunction::setMin — Sets the initial size of the collapse data structures when collapsing on a numeric field only
public SolrCollapseFunction::setMin ( string $min ) : SolrCollapseFunction
Sets the initial size of the collapse data structures when collapsing on a numeric field only
min
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https://www.php.net/manual/en/solrcollapsefunction.setmin.php