报错内容：
class com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock$AggregationStatVisitor cannot be cast to class com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor (com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock$AggregationStatVisitor and com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor are in unnamed module of loader 'app')
