strongduanmu commented on pull request #12420:
URL: https://github.com/apache/shardingsphere/pull/12420#issuecomment-918901824
Because the field type in the Calcite metadata has changed, resulting in a
change in the query plan, testSimpleSelect needs to be modified.
```
After：
LogicalProject(order_id=[$0], user_id=[$1], information=[$4])
LogicalFilter(condition=[=(CAST($1):VARCHAR, CAST($3):VARCHAR)])
LogicalJoin(condition=[true], joinType=[inner])
LogicalTableScan(table=[[federate_jdbc, t_order_federate]])
LogicalTableScan(table=[[federate_jdbc, t_user_info]])
EnumerableCalc(expr#0..4=[{inputs}], proj#0..1=[{exprs}], information=[$t4])
EnumerableCalc(expr#0..4=[{inputs}], expr#5=[CAST($t1):VARCHAR],
expr#6=[CAST($t3):VARCHAR], expr#7=[=($t5, $t6)], proj#0..4=[{exprs}],
$condition=[$t7])
EnumerableNestedLoopJoin(condition=[true], joinType=[inner])
EnumerableTableScan(table=[[federate_jdbc, t_order_federate]])
EnumerableTableScan(table=[[federate_jdbc, t_user_info]])
Before：
LogicalProject(order_id=[$0], user_id=[$1], information=[$4])
LogicalFilter(condition=[=($1, $3)])
LogicalJoin(condition=[true], joinType=[inner])
LogicalTableScan(table=[[federate_jdbc, t_order_federate]])
LogicalTableScan(table=[[federate_jdbc, t_user_info]])
EnumerableCalc(expr#0..4=[{inputs}], proj#0..1=[{exprs}], information=[$t4])
EnumerableCalc(expr#0..4=[{inputs}], expr#5=[=($t1, $t3)],
proj#0..4=[{exprs}], $condition=[$t5])
EnumerableNestedLoopJoin(condition=[true], joinType=[inner])
EnumerableTableScan(table=[[federate_jdbc, t_order_federate]])
EnumerableTableScan(table=[[federate_jdbc, t_user_info]])
```
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