*: fix oom action cancel bug

[crazycs520]

What problem does this PR solve?

set config.OOMAction = "cancel"
before this PR:

create table t1(a int primary key, b double);
insert into t1 values(3,2);

test> select sum(a) from t1 group by b;
+--------+
| sum(a) |
+--------+
| 3      |
+--------+
1 row in set
test> set @@tidb_mem_quota_query=1;
Query OK, 0 rows affected
test> select sum(a) from t1 group by b;
+--------+
| sum(a) |
+--------+
0 rows in set

After This PR:

test> select sum(a) from t1 group by b;
+--------+
| sum(a) |
+--------+
| 3      |
+--------+
1 row in set
Time: 0.006s
test> set @@tidb_mem_quota_query=1;
Query OK, 0 rows affected
Time: 0.001s
test> select sum(a) from t1 group by b;
(1105, u'Out Of Memory Quota![conn_id=1]')

What is changed and how it works?

Check List

Tests

• Unit test

Code changes

• Has exported function/method change

Side effects

Related changes

• Need to cherry-pick to the release branch

[codecov]

Codecov Report

Merging #10993 into master will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             master     #10993   +/-   ##
===========================================
  Coverage   81.0758%   81.0758%           
===========================================
  Files           418        418           
  Lines         89473      89473           
===========================================
  Hits          72541      72541           
  Misses        11710      11710           
  Partials       5222       5222

[codecov]

Codecov Report

Merging #10993 into master will decrease coverage by 0.1508%.
The diff coverage is 100%.

@@               Coverage Diff                @@
##             master     #10993        +/-   ##
================================================
- Coverage   81.1318%   80.9809%   -0.1509%     
================================================
  Files           419        418         -1     
  Lines         90316      89237      -1079     
================================================
- Hits          73275      72265      -1010     
+ Misses        11784      11738        -46     
+ Partials       5257       5234        -23

[crazycs520]

/run-all-tests

[crazycs520]

@zz-jason @tiancaiamao PTAL

[zz-jason]

LGTM

[tiancaiamao]

LGTM

[zz-jason]

needs to be cherry-picked to release-2.1 and release-3.0