ddl: fix the parallel problem of "set default value" and other DDL

[zimulala]

What problem does this PR solve?

The problem occurs as follows:

create table tx (c1 varchar(64), c2 enum('N','Y') not null default 'N', primary key idx2 (c2, c1));
insert into tx values('a', 'N');

Then execute the following DDL statements in parallel:

alter table tx add column cx int after c1
alter table tx alter c2 set default 'N'

Finally execute the following statement:

delete from tx where c1='a'

We will get the error as follows:

value *errors.withStack = [table:2]Index column c2 offset out of bound, offset: 2, row: [{6 0 0 0 0 [97] <nil>} {10 0 0 0 1 [78] <nil>}] ("[table:2]Index column c2 offset out of bound, offset: 2, row: [{6 0 0 0 0 [97] <nil>} {10 0 0 0 1 [78] <nil>}]")

What is changed and how it works?

We don't change the offset when executing the DDL of alter table .. set default.

Check List

Tests

• Unit test

Related changes

• Need to cherry-pick to the release branch

[codecov]

Codecov Report

Merging #11341 into master will decrease coverage by 0.2067%.
The diff coverage is 100%.

@@               Coverage Diff               @@
##             master    #11341        +/-   ##
===============================================
- Coverage   81.4477%   81.241%   -0.2068%     
===============================================
  Files           423       423                
  Lines         90884     90165       -719     
===============================================
- Hits          74023     73251       -772     
- Misses        11577     11602        +25     
- Partials       5284      5312        +28

[crazycs520]

LGTM

[crazycs520]

/run-all-tests

[winkyao]

LGTM

[bb7133]

LGTM

[sre-bot]

cherry pick to release-2.1 failed

[sre-bot]

cherry pick to release-3.0 in PR #11346