fixed 'bad access: nil dereference' when calling Error() method if it…

[henng]

SEE #576

[codecov]

Codecov Report

Merging #577 into master will decrease coverage by 0.01%.
The diff coverage is 50%.

@@ Coverage Diff @@## master #577 +/- ##
==========================================
- Coverage 71.82% 71.81% -0.02% 
==========================================
Files 32 32 Lines 7834 7838 +4 ==========================================
+ Hits 5627 5629 +2 - Misses 1676 1677 +1 - Partials 531 532 +1

Impacted Files	Coverage Δ
terror/terror.go	73.43% <50%> (-0.76%)	⬇️
ast/functions.go	76.74% <0%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update cbfc40a...4a34588. Read the comment docs.

[kennytm]

why e == nil is not enough? *Error is a concrete type unlike interface{}.

[henng]

you are right, e == nil is better.

[kennytm]

(ditto)

[jyno12]

这个现在有啥别的修改？model/ddl中的job也遇到这个问题。

import (
"github.com/pingcap/parser/model"
"testing"
)
func TestJob(t *testing.T) {
j:=model.Job{}
t.Logf("%v",j)
}

由于job中的error为nil也是这个问题。

[tiancaiamao]

Ping @henng ?

[ti-chi-bot]

@henng: PR needs rebase.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.81%. Comparing base (aa72817) to head (081dece).
⚠️ Report is 421 commits behind head on master.

⚠️Current head 081dece differs from pull request most recent head 4a34588

Please upload reports for the commit 4a34588 to get more accurate results.

Additional details and impacted files

@@ Coverage Diff @@## master #577 +/- ##
==========================================
- Coverage 71.82% 71.81% -0.02% 
==========================================
Files 32 32 Lines 7834 7838 +4 ==========================================
+ Hits 5627 5629 +2 - Misses 1676 1677 +1 - Partials 531 532 +1 

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.