com.alibaba.druid.sql.parser.ParserException: syntax error, error in :‘xx)

先来看下 xml

错误信息

14:57:58.150 [http-nio-7070-exec-26] ERROR c.a.d.f.s.StatFilter - [mergeSql,149] - merge sql error, dbType oracle, druid-1.1.14, sql : SELECT *
		FROM (select check_code, check_name, chect_qualification_expires_time,CONCAT('Overdue_', remark)  explain
			FROM JC_CHECK_INFO
			WHERE chect_qualification_expires_time BETWEEN to_date(to_char(sysdate, 'yyyy-mm-dd'),'yyyy-mm-dd') AND to_date(to_char(sysdate+30, 'yyyy-mm-dd'),'yyyy-mm-dd')
			ORDER BY chect_qualification_expires_time )a
		UNION ALL
		
		SELECT *
		FROM (select check_code, check_name, chect_qualification_expires_time,CONCAT('Expired_', remark)  explain
			FROM JC_CHECK_INFO
			WHERE to_date(to_char(sysdate, 'yyyy-mm-dd'),'yyyy-mm-dd') > chect_qualification_expires_time
			ORDER BY chect_qualification_expires_time desc)b
com.alibaba.druid.sql.parser.ParserException: syntax error, error in :'rk)  explain
			FROM JC_CHECK_INFO
', expect RPAREN, actual EXPLAIN pos 116, line 2, column 100, token EXPLAIN
	at com.alibaba.druid.sql.parser.SQLParser.printError(SQLParser.java:287)
	at com.alibaba.druid.sql.parser.SQLParser.accept(SQLParser.java:295)
	at com.alibaba.druid.sql.dialect.oracle.parser.OracleSelectParser.parseTableSourcePrimary(OracleSelectParser.java:651)
	at com.alibaba.druid.sql.dialect.oracle.parser.OracleSelectParser.parseTableSource(OracleSelectParser.java:624)

先声明下sql是没有问题的，运行正常，在xml就会报以上错误信息，但是程序不受影响

sql运行正常，我也一直没找到原因，网上有的说是版本低的原因，解析不了，我…还就不信了，不换版本不行？

后来抱着试一试的心态，结果成功了。原因就是…不要偷懒！！！
取别名时乖乖加上 as 就没问题了

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