sql="CREATE #{index_type} INDEX #{quote_column_name(index_name)}#{index_using} ON #{quote_table_name(table_name)} (#{index_columns}) #{index_algorithm}"
sql="CREATE #{index_type} INDEX #{quote_column_name(index_name)}#{index_using} ON #{quote_table_name(table_name)} (#{index_columns}) #{index_algorithm}".dup