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));
}