*: year type should have an unsigned flag

ddl/db_test.go

@@ -2117,24 +2117,29 @@ func (s *testDBSuite) TestRebaseAutoID(c *C) {
 	s.testErrorCode(c, "alter table tidb.test2 add column b int auto_increment key, auto_increment=10;", tmysql.ErrUnknown)
 }
 
-func (s *testDBSuite) TestYearTypeCreateTable(c *C) {
+func (s *testDBSuite) TestZeroFillCreateTable(c *C) {
 	s.tk = testkit.NewTestKit(c, s.store)
 	s.tk.MustExec("use test")
 	s.tk.MustExec("drop table if exists abc;")
-	s.tk.MustExec("create table abc(y year, x int, primary key(y));")
+	s.tk.MustExec("create table abc(y year, z tinyint(10) zerofill, primary key(y));")
 	is := s.dom.InfoSchema()
 	tbl, err := is.TableByName(model.NewCIStr("test"), model.NewCIStr("abc"))
 	c.Assert(err, IsNil)
-	var yearCol *model.ColumnInfo
+	var yearCol, zCol *model.ColumnInfo
 	for _, col := range tbl.Meta().Columns {
 		if col.Name.String() == "y" {
 			yearCol = col
-			break
+		}
+		if col.Name.String() == "z" {
+			zCol = col
 		}
 	}
 	c.Assert(yearCol, NotNil)
 	c.Assert(yearCol.Tp, Equals, mysql.TypeYear)
-	c.Assert(mysql.HasUnsignedFlag(yearCol.Flag), IsFalse)
+	c.Assert(mysql.HasUnsignedFlag(yearCol.Flag), IsTrue)
+
+	c.Assert(zCol, NotNil)
+	c.Assert(mysql.HasUnsignedFlag(zCol.Flag), IsTrue)
 }
 
 func (s *testDBSuite) TestCheckColumnDefaultValue(c *C) {

ddl/ddl_api.go

@@ -396,6 +396,12 @@ func columnDefToCol(ctx sessionctx.Context, offset int, colDef *ast.ColumnDef, o
 		col.Flag &= ^mysql.BinaryFlag
 		col.Flag |= mysql.ZerofillFlag
 	}
+	// If you specify ZEROFILL for a numeric column, MySQL automatically adds the UNSIGNED attribute to the column.
+	// See https://dev.mysql.com/doc/refman/5.7/en/numeric-type-overview.html for more details.
+	// But some types like bit and year, won't show its unsigned flag in `show create table`.
+	if mysql.HasZerofillFlag(col.Flag) {
+		col.Flag |= mysql.UnsignedFlag
+	}
 	err := checkPriKeyConstraint(col, hasDefaultValue, hasNullFlag, outPriKeyConstraint)
 	if err != nil {
 		return nil, nil, errors.Trace(err)

executor/show_test.go

@@ -362,13 +362,23 @@ func (s *testSuite) TestShow(c *C) {
 
 	// Test show create table year type
 	tk.MustExec(`drop table if exists t`)
-	tk.MustExec(`create table t(y year, x int, primary key(y));`)
+	tk.MustExec(`create table t(y year unsigned signed zerofill zerofill, x int, primary key(y));`)
 	tk.MustQuery(`show create table t`).Check(testutil.RowsWithSep("|",
 		"t CREATE TABLE `t` (\n"+
 			"  `y` year NOT NULL,\n"+
 			"  `x` int(11) DEFAULT NULL,\n"+
 			"  PRIMARY KEY (`y`)\n"+
 			") ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin"))
+
+	// Test show create table with zerofill flag
+	tk.MustExec(`drop table if exists t`)
+	tk.MustExec(`create table t(id int primary key, val tinyint(10) zerofill);`)
+	tk.MustQuery(`show create table t`).Check(testutil.RowsWithSep("|",
+		"t CREATE TABLE `t` (\n"+
+			"  `id` int(11) NOT NULL,\n"+
+			"  `val` tinyint(10) UNSIGNED ZEROFILL DEFAULT NULL,\n"+
+			"  PRIMARY KEY (`id`)\n"+
+			") ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin"))
 }
 
 func (s *testSuite) TestShowVisibility(c *C) {

expression/typeinfer_test.go

@@ -198,7 +198,7 @@ func (s *testInferTypeSuite) createTestCase4Cast() []typeInferTestCase {
 func (s *testInferTypeSuite) createTestCase4Columns() []typeInferTestCase {
 	return []typeInferTestCase{
 		{"c_bit        ", mysql.TypeBit, charset.CharsetBin, mysql.UnsignedFlag, 10, 0},
-		{"c_year       ", mysql.TypeYear, charset.CharsetBin, mysql.ZerofillFlag, 4, 0},
+		{"c_year       ", mysql.TypeYear, charset.CharsetBin, mysql.UnsignedFlag | mysql.ZerofillFlag, 4, 0},
 		{"c_int_d      ", mysql.TypeLong, charset.CharsetBin, 0, 11, 0},
 		{"c_uint_d     ", mysql.TypeLong, charset.CharsetBin, mysql.UnsignedFlag, 10, 0},
 		{"c_bigint_d   ", mysql.TypeLonglong, charset.CharsetBin, 0, 20, 0},

parser/parser.y

@@ -6321,7 +6321,7 @@ DateAndTimeType:
 		}
 		$$ = x
 	}
-|	"YEAR" OptFieldLen
+|	"YEAR" OptFieldLen FieldOpts
 	{
 		x := types.NewFieldType(mysql.TypeYear)
 		x.Flen = $2.(int)

parser/parser_test.go

@@ -1819,6 +1819,7 @@ func (s *testParserSuite) TestType(c *C) {
 
 		// for year
 		{"create table t (y year(4), y1 year)", true},
+		{"create table t (y year(4) unsigned zerofill zerofill, y1 year signed unsigned zerofill)", true},
 
 		// for national
 		{"create table t (c1 national char(2), c2 national varchar(2))", true},

table/column.go

@@ -203,6 +203,9 @@ func (c *Column) GetTypeDesc() string {
 	if mysql.HasUnsignedFlag(c.Flag) && c.Tp != mysql.TypeBit && c.Tp != mysql.TypeYear {
 		desc += " UNSIGNED"
 	}
+	if mysql.HasZerofillFlag(c.Flag) && c.Tp != mysql.TypeYear {
+		desc += " ZEROFILL"
+	}
 	return desc
 }
 

table/column_test.go

@@ -43,7 +43,7 @@ func (t *testTableSuite) TestString(c *C) {
 	col.Collate = mysql.DefaultCollationName
 	col.Flag |= mysql.ZerofillFlag | mysql.UnsignedFlag | mysql.BinaryFlag | mysql.AutoIncrementFlag | mysql.NotNullFlag
 
-	c.Assert(col.GetTypeDesc(), Equals, "tinyint(2) UNSIGNED")
+	c.Assert(col.GetTypeDesc(), Equals, "tinyint(2) UNSIGNED ZEROFILL")
 	col.ToInfo()
 	tbInfo := &model.TableInfo{}
 	c.Assert(col.IsPKHandleColumn(tbInfo), Equals, false)