The stats component can be used to return simple statistics for indexed numeric fields in the document set returned by a Solr query. Let us get the statistics for prices of all books in our index. We will also facet on price and availability (inStock) and see the output.
Create the query to fetch all books and set the number of rows to 0 as we are not interested in the results but only the statistics, which will be fetched as a separate component as given in the following query:
$query->setQuery('cat:book');
$query->setRows(0);Get the stats component and create statistics for field price and create facets on price and inStock fields.
$statsq = $query->getStats();
$statsq->createField('price')->addFacet('price')->addFacet('inStock');Execute the query and fetch the stats component from the result-set as given in the following query:
$resultset = $client->select...