Issue #3113403 by Beakerboy, daffie: Make Drupal\Core\Database\Query\Condition driver overridable

    return $this->schema;

  }

  /**

   * Prepares and returns a CONDITION query object.

   *

   * @param string $conjunction

   *   The operator to use to combine conditions: 'AND' or 'OR'.

   *

   * @return \Drupal\Core\Database\Query\Condition

   *   A new Condition query object.

   *

   * @see \Drupal\Core\Database\Query\Condition

   */

  public function condition($conjunction) {

    $class = $this->getDriverClass('Condition');

    return new $class($conjunction);

  }

  /**

   * Escapes a database name string.

   *

<?php

namespace Drupal\Core\Database\Driver\mysql;

use Drupal\Core\Database\Query\Condition as QueryCondition;

/**

 * MySQL implementation of \Drupal\Core\Database\Query\Condition.

 */

class Condition extends QueryCondition {}

namespace Drupal\Core\Database\Driver\mysql;

use Drupal\Core\Database\Query\Condition;

use Drupal\Core\Database\SchemaException;

use Drupal\Core\Database\SchemaObjectExistsException;

use Drupal\Core\Database\SchemaObjectDoesNotExistException;

  protected function buildTableNameCondition($table_name, $operator = '=', $add_prefix = TRUE) {

    $table_info = $this->getPrefixInfo($table_name, $add_prefix);

    $condition = new Condition('AND');

    $condition = $this->connection->condition('AND');

    $condition->condition('table_schema', $table_info['database']);

    $condition->condition('table_name', $table_info['table'], $operator);

    return $condition;

<?php

namespace Drupal\Core\Database\Driver\pgsql;

use Drupal\Core\Database\Query\Condition as QueryCondition;

/**

 * PostgreSQL implementation of \Drupal\Core\Database\Query\Condition.

 */

class Condition extends QueryCondition {}

<?php

namespace Drupal\Core\Database\Driver\sqlite;

use Drupal\Core\Database\Query\Condition as QueryCondition;

/**

 * SQLite implementation of \Drupal\Core\Database\Query\Condition.

 */

class Condition extends QueryCondition {}