Missing space before UNION when building CREATE VIEW

Summary

When CreateStatement::build() reconstructs a CREATE VIEW ... AS SELECT ... UNION ...
statement, the output misses the whitespace between the built SELECT and the
trailing body tokens. Result: invalid SQL such as ... WHERE 3 = 3union all (...).

This was previously reported downstream in phpMyAdmin:

• phpmyadmin/phpmyadmin#19692
• phpmyadmin/phpmyadmin#18515 (same bug, older)

Reproduction

use PhpMyAdmin\SqlParser\Parser;

$sql = "CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER "
     . "VIEW `v1` AS select 1 AS `a` where 3 = 3 union all (select 2 AS `a`)";

echo (new Parser($sql))->statements[0]->build();

Actual output:

CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1`  AS SELECT 1 AS `a` WHERE 3 = 3union all (select 2 AS `a`)

(note: 3 = 3union all — no space).

Expected: a space before union all, producing valid SQL.

Environment

• Library version: current master (head f440917e)
• PHP: 8.4

从 CreateStatement::build() 开始，通过 PhpMyAdmin\SqlParser\Parser 使用 SQL 示例重现该问题。验证重新构建 CREATE VIEW 时会保留末尾 UNION 主体之前的空白，并生成有效的 SQL，而不是 3union all。