planner/codec: fix issue of decode plan error cause by without escape special char (#21937)

[ti-srebot]

cherry-pick #21937 to release-4.0

---

Signed-off-by: crazycs520 crazycs520@gmail.com

What problem does this PR solve?

• close decode plan in statement summary failed #21642
• Refine projection explain information display.

Before

test> explain select tidb_version();
+---------------+---------+------+---------------+-------------------------------------------------------------------+
| id            | estRows | task | access object | operator info                                                     |
+---------------+---------+------+---------------+-------------------------------------------------------------------+
| Projection_3  | 1.00    | root |               | Release Version: v4.0.0-beta.2-1832-g7fac2ba02                    |
|               |         |      |               | Edition: Community                                                |
|               |         |      |               | Git Commit Hash: 7fac2ba027aee70cad4f4a307240ef5b7e6a64f8         |
|               |         |      |               | Git Branch: master                                                |
|               |         |      |               | UTC Build Time: 2020-12-16 03:32:17                               |
|               |         |      |               | GoVersion: go1.14.4                                               |
|               |         |      |               | Race Enabled: false                                               |
|               |         |      |               | TiKV Min Version: v3.0.0-60965b006877ca7234adaced7890d7b029ed1306 |
|               |         |      |               | Check Table Before Drop: false->Column#1                          |
| └─TableDual_4 | 1.00    | root |               | rows:1                                                            |
+---------------+---------+------+---------------+-------------------------------------------------------------------+

This PR

test> explain select tidb_version();
+---------------+---------+------+---------------+------------------------------------------------+
| id            | estRows | task | access object | operator info                                  |
+---------------+---------+------+---------------+------------------------------------------------+
| Projection_3  | 1.00    | root |               | Release Version: v4.0.0-beta.2-1889-g2b5e3e355 |
|               |         |      |               | Edition: Communit(len:331)->Column#1           |
| └─TableDual_4 | 1.00    | root |               | rows:1                                         |
+---------------+---------+------+---------------+------------------------------------------------+

What is changed and how it works?

N/A

Related changes

• Need to cherry-pick to the release branch

Check List

Tests

• Unit test

Side effects

• Performance regression
  • Consumes more CPU
  • Consumes more MEM

Release note

• Fix issue of decode plan error cause by without escape special char.

[ti-srebot]

/run-all-tests

[ti-srebot]

@crazycs520 you're already a collaborator in bot's repo.

[crazycs520]

@wjhuang2016 @XuHuaiyu PTAL

[wjhuang2016]

LGTM

[XuHuaiyu]

/merge

[ti-srebot]

Sorry @XuHuaiyu, you don't have permission to trigger auto merge event on this branch.

[zz-jason]

/merge

[ti-srebot]

Sorry @zz-jason, this branch's release version is in progress, please contact zhouqiang-cl,shuke987,jebter,you06 for more details.

[qw4990]

/run-all-tests

[zz-jason]

/merge

[ti-srebot]

Your auto merge job has been accepted, waiting for:

• 21323
• 21329
• 21404
• 21443
• 21473
• 21477
• 21582
• 21593
• 21602
• 21604
• 21610
• 21623
• 21635
• 21958
• 22116
• 22148
• 22353
• 21488
• 21546
• 21573
• 21608
• 21665
• 21673
• 21718
• 21785
• 21810
• 21813
• 21971
• 21916
• 21969

[ti-srebot]

/run-all-tests