ddl: fix 'show create table' result not correct when the table with a compression option (#7793)

Author: ciscoxll

executor/show.go

@@ -598,7 +598,7 @@ func (e *ShowExec) fetchShowCreateTable() error {
 
 	// Displayed if the compression typed is set.
 	if len(tb.Meta().Compression) != 0 {
-		buf.WriteString(fmt.Sprintf(" COMPRESSION=`%s`", tb.Meta().Compression))
+		buf.WriteString(fmt.Sprintf(" COMPRESSION='%s'", tb.Meta().Compression))
 	}
 
 	// add partition info here.

executor/show_test.go

@@ -397,7 +397,7 @@ func (s *testSuite) TestShow(c *C) {
 	tk.MustQuery("show create table t1").Check(testutil.RowsWithSep("|",
 		"t1 CREATE TABLE `t1` (\n"+
 			"  `c1` int(11) DEFAULT NULL\n"+
-			") ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMPRESSION=`zlib`",
+			") ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMPRESSION='zlib'",
 	))
 
 	// Test show create table year type