expression: fix type infer of unaryMinus which should return ETDecimal if ETInt overflow int

[lonng]

Signed-off-by: Lonng heng@lonng.org

What problem does this PR solve?

Fix #11983

The typeInfer of unaryMinus function should return types.ETDecimal if the inferred type is types.ETInt and the value will overflow the int bound.

mysql> create table f (a decimal(65, 0));
Query OK, 0 rows affected (0.02 sec)

mysql> insert into f value (-17000000000000000000);
ERROR 1264 (22003): Out of range value for column 'a' at row 1

What is changed and how it works?

Relax restrictions of the unaryMinus.typeInfer which should alway handle int overflow instead of just in SELECT statement.

Check List

Tests

• Unit test
• Integration test

Related changes

• Need to update the tidb-ansible repository

Release note

• Fix type infers of unaryMinus which should return ETDecimal if the ETInt overflow int bound.

[codecov]

Codecov Report

Merging #11989 into master will decrease coverage by 0.0534%.
The diff coverage is 100%.

@@               Coverage Diff                @@
##             master     #11989        +/-   ##
================================================
- Coverage   81.2782%   81.2248%   -0.0535%     
================================================
  Files           444        443         -1     
  Lines         95130      95019       -111     
================================================
- Hits          77320      77179       -141     
- Misses        12322      12347        +25     
- Partials       5488       5493         +5

[lonng]

/run-all-tests

[winkyao]

LGTM

[crazycs520]

LGTM

[sre-bot]

/run-all-tests

[lonng]

/run-cherry-picker

[sre-bot]

cherry pick to release-2.1 in PR #11990

[sre-bot]

cherry pick to release-3.0 in PR #11991