*: use golang built-in functions rather than mathutil (pingcap#56818)

close pingcap#56594

Author: songzhibin97

goyacc/main.go

@@ -361,7 +361,7 @@ func main1(in string) (err error) {
 			if k == 'r' {
 				arg = -arg
 			}
-			minArg, maxArg = mathutil.Min(minArg, arg), mathutil.Max(maxArg, arg)
+			minArg, maxArg = min(minArg, arg), max(maxArg, arg)
 		}
 	}
 	su := make(symsUsed, 0, len(msu))
@@ -389,7 +389,7 @@ type %[1]sXError struct {
 	for sym := range msu {
 		nm := sym.Name
 		if nm == "$default" || nm == "$end" || sym.IsTerminal && nm[0] != '\'' && sym.Value > 0 {
-			maxTokName = mathutil.Max(maxTokName, len(nm))
+			maxTokName = max(maxTokName, len(nm))
 			a = append(a, nm)
 		}
 		nsyms[nm] = sym
@@ -476,7 +476,7 @@ type %[1]sXError struct {
 				panic("internal error 001")
 			}
 
-			maxv = mathutil.Max(maxv, xsym)
+			maxv = max(maxv, xsym)
 			kind, arg := act.Kind()
 			switch kind {
 			case 'a':

types/BUILD.bazel

@@ -14,7 +14,6 @@ go_library(
         "//pkg/parser/format",
         "//pkg/parser/mysql",
         "//pkg/parser/terror",
-        "@com_github_cznic_mathutil//:mathutil",
     ],
 )
 

types/field_type.go

@@ -21,7 +21,6 @@ import (
 	"strings"
 	"unsafe"
 
-	"github.com/cznic/mathutil"
 	"github.com/pingcap/tidb/pkg/parser/charset"
 	"github.com/pingcap/tidb/pkg/parser/format"
 	"github.com/pingcap/tidb/pkg/parser/mysql"
@@ -243,7 +242,7 @@ func (ft *FieldType) SetFlen(flen int) {
 // SetFlenUnderLimit sets the length of the field to the value of the argument
 func (ft *FieldType) SetFlenUnderLimit(flen int) {
 	if ft.GetType() == mysql.TypeNewDecimal {
-		ft.flen = mathutil.Min(flen, mysql.MaxDecimalWidth)
+		ft.flen = min(flen, mysql.MaxDecimalWidth)
 	} else {
 		ft.flen = flen
 	}
@@ -257,7 +256,7 @@ func (ft *FieldType) SetDecimal(decimal int) {
 // SetDecimalUnderLimit sets the decimal of the field to the value of the argument
 func (ft *FieldType) SetDecimalUnderLimit(decimal int) {
 	if ft.GetType() == mysql.TypeNewDecimal {
-		ft.decimal = mathutil.Min(decimal, mysql.MaxDecimalScale)
+		ft.decimal = min(decimal, mysql.MaxDecimalScale)
 	} else {
 		ft.decimal = decimal
 	}