Plan in statement summary tables is lack of tikv/tiflash info

[djshow832]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

mysql> explain select * from t;
+-----------------------+----------+-----------+---------------+--------------------------------+
| id                    | estRows  | task      | access object | operator info                  |
+-----------------------+----------+-----------+---------------+--------------------------------+
| TableReader_5         | 10000.00 | root      |               | data:TableFullScan_4           |
| └─TableFullScan_4     | 10000.00 | cop[tikv] | table:t       | keep order:false, stats:pseudo |
+-----------------------+----------+-----------+---------------+--------------------------------+
2 rows in set (0.01 sec)

mysql> select * from t;
Empty set (0.00 sec)

mysql> select plan from information_schema.statements_summary where digest_text='select * from t';
+----------------------------------------------------------------------------------------------------------------------+
| plan                                                                                                                 |
+----------------------------------------------------------------------------------------------------------------------+
| 	TableReader_5	root	10000	data:TableFullScan_4
	└─TableScan_4	cop 	10000	table:t, keep order:false, stats:pseudo     |
+----------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

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

Plan in information_schema.statements_summary should be the same with explain, which contains tikv/tiflash info.

3. Affected version (Required)

v4.0.0

4. Root Cause Analysis

[pingyu]

Let me fix it.