expression: handle ErrTruncated when dividing decimals in non-data-change stmts

[qw4990]

What problem does this PR solve?

Handle ErrTruncated when dividing decimals.
Before this PR:

mysql> select cast(1 as decimal(60,30)) / cast(3 as decimal(60,30)) / cast(3 as decimal(60, 30));
ERROR 1265 (01000): Data truncated for column '%s' at row %d

After this PR:

mysql> select cast(1 as decimal(60,30)) / cast(3 as decimal(60,30)) / cast(3 as decimal(60, 30));
+------------------------------------------------------------------------------------+
| cast(1 as decimal(60,30)) / cast(3 as decimal(60,30)) / cast(3 as decimal(60, 30)) |
+------------------------------------------------------------------------------------+
|                                                   0.111111111111111111111111111111 |
+------------------------------------------------------------------------------------+

In MySQL:

mysql> select cast(1 as decimal(60,30)) / cast(3 as decimal(60,30)) / cast(3 as decimal(60, 30));
+------------------------------------------------------------------------------------+
| cast(1 as decimal(60,30)) / cast(3 as decimal(60,30)) / cast(3 as decimal(60, 30)) |
+------------------------------------------------------------------------------------+
|                                                   0.111111111111111111111111111111 |
+------------------------------------------------------------------------------------+

Check List

Tests

• Unit test

[qw4990]

/run-all-tests

[SunRunAway]

Please fix the test case.

[qw4990]

/run-all-tests

[qw4990]

/rebuild

[qw4990]

/run-all-tests

[qw4990]

/run-all-tests

[qw4990]

/run-all-tests

[qw4990]

/run-unit-test

[qw4990]

@SunRunAway @XuHuaiyu @wshwsh12 All CI problems have been resolved, PTAL~!

[XuHuaiyu]

MySQL works fine...

tidb> create table t(a int);
Query OK, 0 rows affected (0.01 sec)

tidb> insert into t values(cast(1 as decimal(60,30)) / cast(3 as decimal(60,30)) / cast(3 as decimal(60, 30)));
ERROR 1292 (22007): Truncated incorrect DECIMAL value: '0.111111111111111111111111111111'

[qw4990]

MySQL works fine...

tidb> create table t(a int);
Query OK, 0 rows affected (0.01 sec)

tidb> insert into t values(cast(1 as decimal(60,30)) / cast(3 as decimal(60,30)) / cast(3 as decimal(60, 30)));
ERROR 1292 (22007): Truncated incorrect DECIMAL value: '0.111111111111111111111111111111'

What's the version of your MySQL? In my MySQL 8x, the result is below:

mysql> create table t (a int);
Query OK, 0 rows affected (0.02 sec)

mysql> insert into t values(cast(1 as decimal(60,30)) / cast(3 as decimal(60,30)) / cast(3 as decimal(60, 30)));
Query OK, 1 row affected (0.02 sec)

[XuHuaiyu]

LGTM

[wshwsh12]

LGTM

[sre-bot]

/run-all-tests

[sre-bot]

@qw4990 merge failed.

[qw4990]

/run-unit-test

[qw4990]

/run-all-tests

[qw4990]

/run-all-tests

[qw4990]

/run-all-tests

[sre-bot]

cherry pick to release-3.0 failed

[sre-bot]

It seems that, not for sure, we failed to cherry-pick this commit to release-3.0. Please comment '/run-cherry-picker' to try to trigger the cherry-picker if we did fail to cherry-pick this commit before. @qw4990 PTAL.