hook_entity_query_alter(\Drupal\Core\Entity\Query\QueryInterface $query)
Alter or execute an Drupal\Core\Entity\Query\EntityQueryInterface.
\Drupal\Core\Entity\Query\QueryInterface $query: Note the $query->altered attribute which is TRUE in case the query has already been altered once. This happens with cloned queries. If there is a pager, then such a cloned query will be executed to count all elements. This query can be detected by checking for ($query->pager && $query->count), allowing the driver to return 0 from the count query and disable the pager.
function hook_entity_query_alter(\Drupal\Core\Entity\Query\QueryInterface $query) { // @todo: code example. }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!entity.api.php/function/hook_entity_query_alter/8.1.x