[BUG] ODPS 在解析连续 INNER JOIN 时将 INNER 错误识别为别名

• INNER JOIN followed by INNER JOIN
• LEFT/RIGHT/FULL JOIN followed by INNER JOIN
• Three consecutive INNER JOIN
• Verify that the join types and aliases remain consistent before and after the "parse - serialize - parse" process
• Verify that the serialized result does not introduce AS INNER

This issue has been reproducibly with the official Maven Central com.alibaba:druid:1.2.28 stable release. Check the master source code of the current 1.2.29-SNAPSHOT (commit