How "gcInactiveDestinations" works with ActiveMQ ?

Issue

• I have enabled gcInactiveDestinations like :

    <broker xmlns="http://activemq.apache.org/schema/core"
        brokerName="${broker-name}" dataDirectory="${data}" start="false"
        restartAllowed="false" schedulePeriodForDestinationPurge="10000">

        <destinations>
                 <queue physicalName="FOO.BAR" />
                 <topic physicalName="SOME.TOPIC" />
         </destinations>

         <destinationPolicy>
            <policyMap>
            <policyEntries>
                                 <policyEntry queue=">" producerFlowControl="true"  memoryLimit="1mb" gcInactiveDestinations="true"   inactiveTimoutBeforeGC="30000"/>
            </policyEntries>
        </policyMap>
    </destinationPolicy>

• Will it delete only inactive empty queues or delete inactive queues with messages ?