fix the operator info (#15291)

correlated-subquery-optimization.md

@@ -100,4 +100,4 @@ explain select * from t1 where t1.a < (select sum(t2.a) from t2 where t2.b = t1.
 +------------------------------------------+-----------+-----------+------------------------+--------------------------------------------------------------------------------------+
 ```
 
-After disabling the subquery decorrelation rule, you can see `range: decided by [eq(test.t2.b, test.t1.b)]` in `operator info` of `IndexRangeScan_25(Build)`. It means that the decorrelation of correlated subquery is not performed and TiDB uses the index range query.
+After disabling the subquery decorrelation rule, you can see `range: decided by [eq(test.t2.b, test.t1.b)]` in `operator info` of `IndexRangeScan_42(Build)`. It means that the decorrelation of correlated subquery is not performed and TiDB uses the index range query.

explain-subqueries.md

@@ -67,11 +67,11 @@ EXPLAIN SELECT * FROM t1 WHERE id IN (SELECT t1_id FROM t2);
 +--------------------------------+----------+-----------+------------------------------+---------------------------------------------------------------------------------------------------------------------------+
 ```
 
-From the query results above, you can see that TiDB uses the index join operation `| IndexJoin_14` to join and transform the subquery. In the execution plan, the execution process is as follows:
+From the query results above, you can see that TiDB uses the index join operation `IndexJoin_15` to join and transform the subquery. In the execution plan, the execution process is as follows:
 
-1. The index scanning operator `└─IndexFullScan_31` at the TiKV side reads the values of the `t2.t1_id` column.
-2. Some tasks of the `└─StreamAgg_39` operator deduplicate the values of `t1_id` in TiKV.
-3. Some tasks of the `├─StreamAgg_49(Build)` operator deduplicate the values of `t1_id` in TiDB. The deduplication is performed by the aggregate function `firstrow(test.t2.t1_id)`.
+1. The index scanning operator `└─IndexFullScan_26` at the TiKV side reads the values of the `t2.t1_id` column.
+2. Some tasks of the `└─StreamAgg_34` operator deduplicate the values of `t1_id` in TiKV.
+3. Some tasks of the `├─StreamAgg_44(Build)` operator deduplicate the values of `t1_id` in TiDB. The deduplication is performed by the aggregate function `firstrow(test.t2.t1_id)`.
 4. The operation results are joined with the primary key of the `t1` table. The join condition is `eq(test.t1.id, test.t2.t1_id)`.
 
 ## Inner join (unique subquery)