table的 alias在查询里面忘记添加了

[steven0lisa]

下面是示例语句

select orders0_.id as id1_5_, orders0_.create_time as create_t2_5_, orders0_.update_time as update_t3_5_, orders0_.delivered as delivere4_5_, orders0_.mch_order_no as mch_orde5_5_, orders0_.merchant_id as merchant6_5_, orders0_.num as num7_5_, orders0_.order_no as order_no8_5_, orders0_.paid as paid9_5_, orders0_.product_id as product10_5_ from orders orders0_ 
where orders0_.merchant_id=‘HsPSlXcm37rkzMNHti4'  and orders0_.mch_order_no='20170717163649132' limit 1

解析后分发到全部节点的语句变成了

SELECT orders0_.id AS id1_5_, orders0_.create_time AS create_t2_5_, orders0_.update_time AS update_t3_5_, orders0_.delivered AS delivere4_5_, orders0_.mch_order_no AS mch_orde5_5_
	, orders0_.merchant_id AS merchant6_5_, orders0_.num AS num7_5_, orders0_.order_no AS order_no8_5_, orders0_.paid AS paid9_5_, orders0_.product_id AS product10_5_
FROM orders_1
WHERE orders0_.merchant_id = HsPSlXcm37rkzMNHti4
LIMIT 10000

from后面漏了 orders0_ 这个。

修复方法：

//io.mycat.route.parser.druid.impl.DruidSelectParser

//more code ...
			if(rrs.isDistTable()){
				SQLTableSource from = mysqlSelectQuery.getFrom();

				for (RouteResultsetNode node : rrs.getNodes()) {
					SQLIdentifierExpr sqlIdentifierExpr = new SQLIdentifierExpr();
					sqlIdentifierExpr.setParent(from);
					sqlIdentifierExpr.setName(node.getSubTableName());
                                      //这句漏传了一个参数，导致alias丢失
                                      //SQLExprTableSource from2 = new SQLExprTableSource(sqlIdentifierExpr);
                                      //更正为下面语句即可
					SQLExprTableSource from2 = new SQLExprTableSource(sqlIdentifierExpr, from.getAlias());
					mysqlSelectQuery.setFrom(from2);
					node.setStatement(stmt.toString());
	            }
			}

目前测试过，1.6.5 1.7都存在这个问题，而这种alias常被用于hibernate。