scan details of store-batched copr are not correctly handled

[you06]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

Prepare with this script.

Run the query with batch

set session tidb_store_batch_size = 4;
explain analyze select * from t force index(i) where c1 = "yes";

2. What did you expect to see? (Required)

MySQL [test]> set session tidb_store_batch_size = 4;
Query OK, 0 rows affected (0.001 sec)

MySQL [test]> explain analyze select * from t force index(i) where c1 = "yes";
+-------------------------------+---------+---------+-----------+----------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------+---------+------+
| id                            | estRows | actRows | task      | access object        | execution info                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | operator info                         | memory  | disk |
+-------------------------------+---------+---------+-----------+----------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------+---------+------+
| IndexLookUp_7                 | 911.94  | 1000    | root      |                      | time:34.4ms, loops:2, index_task: {total_time: 3.44ms, fetch_handle: 3.43ms, build: 5.24µs, wait: 6.71µs}, table_task: {total_time: 30.6ms, num: 1, concurrency: 5}                                                                                                                                                                                                                                                                                                                                                          |                                       | 52.6 KB | N/A  |
| ├─IndexRangeScan_5(Build)     | 911.94  | 1000    | cop[tikv] | table:t, index:i(c1) | time:3.36ms, loops:3, cop_task: {num: 3, max: 1.25ms, min: 868.2µs, avg: 1.07ms, p95: 1.25ms, max_proc_keys: 480, p95_proc_keys: 480, rpc_num: 3, rpc_time: 3.12ms, copr_cache: disabled, distsql_concurrency: 15}, tikv_task:{proc max:1ms, min:0s, avg: 333.3µs, p80:1ms, p95:1ms, iters:11, tasks:3}, scan_detail: {total_process_keys: 1000, total_process_keys_size: 58000, total_keys: 1003, get_snapshot_time: 75.1µs, rocksdb: {delete_skipped_count: 75, key_skipped_count: 1075, block: {cache_hit_count: 10}}}    | range:["yes","yes"], keep order:false | N/A     | N/A  |
| └─TableRowIDScan_6(Probe)     | 911.94  | 200     | cop[tikv] | table:t              | time:20.9ms, loops:2, cop_task: {num: 200, max: 6.19ms, min: 473.4µs, avg: 3.04ms, p95: 5.34ms, max_proc_keys: 1, p95_proc_keys: 1, rpc_num: 200, rpc_time: 603.1ms, copr_cache: disabled, distsql_concurrency: 15}, tikv_task:{proc max:1ms, min:0s, avg: 30µs, p80:0s, p95:0s, iters:200, tasks:200}, scan_detail: {total_process_keys: 200, total_process_keys_size: 9185, total_keys: 200, get_snapshot_time: 7.72ms, rocksdb: {block: {cache_hit_count: 314}}}                                                          | keep order:false                      | N/A     | N/A  |
+-------------------------------+---------+---------+-----------+----------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------+---------+------+
3 rows in set (0.036 sec)

3. What did you see instead (Required)

actRows should be 1,000, if the coprocessor cache is turned off, total_process_keys should also be at least 1,000.

4. What is your TiDB version? (Required)

Release Version: v6.5.0
Edition: Community
Git Commit Hash: 706c3fa3c526cdba5b3e9f066b1a568fb96c56e3
Git Branch: heads/refs/tags/v6.5.0
UTC Build Time: 2022-12-27 03:50:44
GoVersion: go1.19.3
Race Enabled: false
TiKV Min Version: 6.2.0-alpha
Check Table Before Drop: false
Store: tikv