fix issue5462 (#5463) (#5492)

Author: jackysp

executor/show.go

@@ -529,7 +529,7 @@ func (e *ShowExec) fetchShowCreateTable() error {
 			}
 			cols = append(cols, colInfo)
 		}
-		buf.WriteString(fmt.Sprintf("(%s)", strings.Join(cols, "`,`")))
+		buf.WriteString(fmt.Sprintf("(%s)", strings.Join(cols, ",")))
 		if i != len(tb.Indices())-1 {
 			buf.WriteString(",\n")
 		}

executor/show_test.go

@@ -35,7 +35,7 @@ func (s *testSuite) TestShow(c *C) {
 
 	testSQL := `drop table if exists show_test`
 	tk.MustExec(testSQL)
-	testSQL = `create table SHOW_test (id int PRIMARY KEY AUTO_INCREMENT, c1 int comment "c1_comment", c2 int, c3 int default 1, c4 text, key idx_wide_c4(c4(10))) ENGINE=InnoDB AUTO_INCREMENT=28934 DEFAULT CHARSET=utf8 COMMENT "table_comment";`
+	testSQL = `create table SHOW_test (id int PRIMARY KEY AUTO_INCREMENT, c1 int comment "c1_comment", c2 int, c3 int default 1, c4 text, key idx_wide_c4(c3, c4(10))) ENGINE=InnoDB AUTO_INCREMENT=28934 DEFAULT CHARSET=utf8 COMMENT "table_comment";`
 	tk.MustExec(testSQL)
 
 	testSQL = "show columns from show_test;"
@@ -48,7 +48,7 @@ func (s *testSuite) TestShow(c *C) {
 	row := result.Rows()[0]
 	// For issue https://github.com/pingcap/tidb/issues/1061
 	expectedRow := []interface{}{
-		"SHOW_test", "CREATE TABLE `SHOW_test` (\n  `id` int(11) NOT NULL AUTO_INCREMENT,\n  `c1` int(11) DEFAULT NULL COMMENT 'c1_comment',\n  `c2` int(11) DEFAULT NULL,\n  `c3` int(11) DEFAULT '1',\n  `c4` text DEFAULT NULL,\n  PRIMARY KEY (`id`),\n  KEY `idx_wide_c4` (`c4`(10))\n) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin AUTO_INCREMENT=28934 COMMENT='table_comment'"}
+		"SHOW_test", "CREATE TABLE `SHOW_test` (\n  `id` int(11) NOT NULL AUTO_INCREMENT,\n  `c1` int(11) DEFAULT NULL COMMENT 'c1_comment',\n  `c2` int(11) DEFAULT NULL,\n  `c3` int(11) DEFAULT '1',\n  `c4` text DEFAULT NULL,\n  PRIMARY KEY (`id`),\n  KEY `idx_wide_c4` (`c3`,`c4`(10))\n) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin AUTO_INCREMENT=28934 COMMENT='table_comment'"}
 	for i, r := range row {
 		c.Check(r, Equals, expectedRow[i])
 	}