ddl: convert hexLit to stringLit in enum and set default value. (#20459)

ddl/db_integration_test.go

@@ -2530,3 +2530,21 @@ func (s *testIntegrationSuite3) TestIssue20490(c *C) {
 
 	tk.MustQuery("select b from issue20490 order by a;").Check(testkit.Rows("1", "1", "<nil>"))
 }
+
+// TestDefaultValueIsLatin1 for issue #18977
+func (s *testIntegrationSuite3) TestEnumAndSetDefaultValue(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	tk.MustExec("use test")
+	tk.MustExec("drop table if exists t")
+	defer tk.MustExec("drop table if exists t")
+	tk.MustExec("create table t (a enum(0x61, 'b') not null default 0x61, b set(0x61, 'b') not null default 0x61) character set latin1")
+	tbl := testGetTableByName(c, s.ctx, "test", "t")
+	c.Assert(tbl.Meta().Columns[0].DefaultValue, Equals, "a")
+	c.Assert(tbl.Meta().Columns[1].DefaultValue, Equals, "a")
+
+	tk.MustExec("drop table t")
+	tk.MustExec("create table t (a enum(0x61, 'b') not null default 0x61, b set(0x61, 'b') not null default 0x61) character set utf8mb4")
+	tbl = testGetTableByName(c, s.ctx, "test", "t")
+	c.Assert(tbl.Meta().Columns[0].DefaultValue, Equals, "a")
+	c.Assert(tbl.Meta().Columns[1].DefaultValue, Equals, "a")
+}

ddl/ddl_api.go

@@ -742,7 +742,7 @@ func getDefaultValue(ctx sessionctx.Context, col *table.Column, c *ast.ColumnOpt
 		if tp == mysql.TypeBit ||
 			tp == mysql.TypeString || tp == mysql.TypeVarchar || tp == mysql.TypeVarString ||
 			tp == mysql.TypeBlob || tp == mysql.TypeLongBlob || tp == mysql.TypeMediumBlob || tp == mysql.TypeTinyBlob ||
-			tp == mysql.TypeJSON {
+			tp == mysql.TypeJSON || tp == mysql.TypeEnum || tp == mysql.TypeSet {
 			// For BinaryLiteral / string fields, when getting default value we cast the value into BinaryLiteral{}, thus we return
 			// its raw string content here.
 			return v.GetBinaryLiteral().ToString(), false, nil