[parser] Fix issue with warning count for error 1068 (#1269)

Closes: #1268

parser/go.mod

@@ -9,7 +9,7 @@ require (
 	github.com/cznic/y v0.0.0-20170802143616-045f81c6662a
 	github.com/go-sql-driver/mysql v1.3.0
 	github.com/pingcap/check v0.0.0-20190102082844-67f458068fc8
-	github.com/pingcap/errors v0.11.5-0.20210513014640-40f9a1999b3b
+	github.com/pingcap/errors v0.11.5-0.20210425183316-da1aaba5fb63
 	github.com/pingcap/log v0.0.0-20210625125904-98ed8e2eb1c7
 	github.com/remyoudompheng/bigfft v0.0.0-20200410134404-eec4a21b6bb0 // indirect
 	go.uber.org/zap v1.18.1

parser/go.sum

@@ -27,8 +27,8 @@ github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/pingcap/check v0.0.0-20190102082844-67f458068fc8 h1:USx2/E1bX46VG32FIw034Au6seQ2fY9NEILmNh/UlQg=
 github.com/pingcap/check v0.0.0-20190102082844-67f458068fc8/go.mod h1:B1+S9LNcuMyLH/4HMTViQOJevkGiik3wW2AN9zb2fNQ=
 github.com/pingcap/errors v0.11.0/go.mod h1:Oi8TUi2kEtXXLMJk9l1cGmz20kV3TaQ0usTwv5KuLY8=
-github.com/pingcap/errors v0.11.5-0.20210513014640-40f9a1999b3b h1:j9MP8ma4e75tckq11+n4EhB2xq0xwYNoxL8w9JTZRhs=
-github.com/pingcap/errors v0.11.5-0.20210513014640-40f9a1999b3b/go.mod h1:X2r9ueLEUZgtx2cIogM0v4Zj5uvvzhuuiu7Pn8HzMPg=
+github.com/pingcap/errors v0.11.5-0.20210425183316-da1aaba5fb63 h1:+FZIDR/D97YOPik4N4lPDaUcLDF/EQPogxtlHB2ZZRM=
+github.com/pingcap/errors v0.11.5-0.20210425183316-da1aaba5fb63/go.mod h1:X2r9ueLEUZgtx2cIogM0v4Zj5uvvzhuuiu7Pn8HzMPg=
 github.com/pingcap/log v0.0.0-20210625125904-98ed8e2eb1c7 h1:k2BbABz9+TNpYRwsCCFS8pEEnFVOdbgEjL/kTlLuzZQ=
 github.com/pingcap/log v0.0.0-20210625125904-98ed8e2eb1c7/go.mod h1:8AanEdAHATuRurdGxZXBz0At+9avep+ub7U1AGYLIMM=
 github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=