}
		case "salary":
			if precision, o, _ := columnType.DecimalSize(); (fullSupported || precision != 0) && precision != 2 {
				t.Fatalf("salary's precision should be 2, but got %v %v", precision, o)
			}
		case "birthday":
			if precision, _, _ := columnType.DecimalSize(); (fullSupported || precision != 0) && precision != 2 {

				if !field.PrimaryKey &&
					(len(matches2) == 1 && matches2[0][1] != fmt.Sprint(length) && ok) {
					alterColumn = true
				}
			}
		}

		// check precision
		if precision, _, ok := columnType.DecimalSize(); ok && int64(field.Precision) != precision {
			if regexp.MustCompile(fmt.Sprintf("[^0-9]%d[^0-9]", field.Precision)).MatchString(m.DataTypeOf(field)) {
				alterColumn = true
			}
		}
	}

// by the driver ok is false.
func (ci *ColumnType) Length() (length int64, ok bool) {
	return ci.length, ci.hasLength
}

// DecimalSize returns the scale and precision of a decimal type.
// If not applicable or if not supported ok is false.
func (ci *ColumnType) DecimalSize() (precision, scale int64, ok bool) {
	return ci.precision, ci.scale, ci.hasPrecisionScale
}

		{"TBSCertificateList.ThisUpdate", Field, 0},
		{"TBSCertificateList.Version", Field, 0},
	},
	"database/sql": {
		{"(*ColumnType).DatabaseTypeName", Method, 8},
		{"(*ColumnType).DecimalSize", Method, 8},
		{"(*ColumnType).Length", Method, 8},
		{"(*ColumnType).Name", Method, 8},
		{"(*ColumnType).Nullable", Method, 8},
		{"(*ColumnType).ScanType", Method, 8},
		{"(*Conn).BeginTx", Method, 9},