(PECL solr >= 2.2.0)
Selects the group heads by the max value of a numeric field or function query.
public SolrCollapseFunction SolrCollapseFunction::setMax ( string $max )
Selects the group heads by the max value of a numeric field or function query.
Parameters:
max
Selects the group heads by the max value of a numeric field or function query.
Returns:
Examples:
SolrCollapseFunction::setMax() example
<?php
$func = new SolrCollapseFunction('field_name');
$func->setMax('sum(cscore(),field(some_field))');
$query = new SolrQuery('*:*');
$query->collapse($func);
?>
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