public QueryAggregateInterface::sortAggregate($field, $function, $direction = 'ASC', $langcode = NULL)
Sorts by an aggregated value.
string $field: The name of a field.
string $function: The aggregate function. This is only marked optional for interface compatibility, it is illegal to leave it out.
string $direction: The order of sorting, either DESC for descending of ASC for ascending.
string $langcode: (optional) The language code.
\Drupal\Core\Entity\Query\QueryAggregateInterface The called object.
public function sortAggregate($field, $function, $direction = 'ASC', $langcode = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Query!QueryAggregateInterface.php/function/QueryAggregateInterface::sortAggregate/8.1.x