quietone
--- a/core/lib/Drupal/Core/Database/Connection.php
+++ b/core/lib/Drupal/Core/Database/Connection.php
    return $this->connection->getAttribute(\PDO::ATTR_SERVER_VERSION);
  }

-  /**
-   * Returns the version of the database client.
-   *
-   * Assumes the client connection is \PDO. Non-PDO based drivers need to
-   * override this method.
-   *
-   * @return string
-   */
-  public function clientVersion() {
-    return $this->connection->getAttribute(\PDO::ATTR_CLIENT_VERSION);
-  }