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Expanded class hierarchy of Upsert in Drupal 8

class \Drupal\Core\Database\Query\Query implements PlaceholderInterface
- class \Drupal\Core\Database\Query\Delete implements ConditionInterface uses QueryConditionTrait
- class \Drupal\Core\Database\Query\Insert implements \Drupal\Core\Database\Query\Countable uses InsertTrait
- class \Drupal\Core\Database\Query\Merge implements ConditionInterface uses QueryConditionTrait
- class \Drupal\Core\Database\Query\Select implements SelectInterface uses QueryConditionTrait
- class \Drupal\Core\Database\Query\Truncate
- class \Drupal\Core\Database\Query\Update implements ConditionInterface uses QueryConditionTrait
- class \Drupal\Core\Database\Query\Upsert implements \Drupal\Core\Database\Query\Countable uses InsertTrait
  - class \Drupal\Core\Database\Driver\mysql\Upsert
  - class \Drupal\Core\Database\Driver\pgsql\NativeUpsert
  - class \Drupal\Core\Database\Driver\pgsql\Upsert
    class \Drupal\driver_test\Driver\Database\DrivertestPgsql\Upsert
  - class \Drupal\Core\Database\Driver\sqlite\Upsert
  - class \Drupal\Driver\Database\sqlsrv\Upsert
  - class \Drupal\Driver\Database\sqlsrv\Upsert