(PECL solr >= 2.2.0)
Sets the NULL Policy
public SolrCollapseFunction SolrCollapseFunction::setNullPolicy ( string $nullPolicy )
Sets the NULL Policy. One of the 3 policies defined as class constants shall be passed. Accepts ignore, expand, or collapse policies.
Parameters:
nullPolicy
Sets the NULL Policy. One of the 3 policies defined as class constants shall be passed. Accepts ignore, expand, or collapse policies.
Returns:
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