/**
  * {@inheritDoc}
  */
 public function indexSql(Table $table, $name)
 {
     $data = $table->index($name);
     $columns = array_map([$this->_driver, 'quoteIdentifier'], $data['columns']);
     return sprintf('CREATE INDEX %s ON %s (%s)', $this->_driver->quoteIdentifier($name), $this->_driver->quoteIdentifier($table->name()), implode(', ', $columns));
 }