All classes that implement QueryInterface in Zircon Profile 8.0

class \Drupal\Core\Config\Entity\Query\Query implements QueryInterface
class \Drupal\Core\Entity\KeyValueStore\Query\Query
class \Drupal\Core\Entity\Query\Null\Query implements QueryAggregateInterface, QueryInterface
class \Drupal\Core\Entity\Query\QueryBase implements QueryInterface
class \Drupal\Core\Entity\Query\Sql\Query implements QueryInterface
class \Drupal\Core\Entity\Query\Sql\QueryAggregate implements QueryAggregateInterface

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