MDEV-20210 If you have an INVISIBLE VIRTUAL column, SHOW CREATE TABLE doesn't list it as INVISIBLE

mysql-test/main/invisible_field_debug.result

@@ -376,3 +376,15 @@ SET debug_dbug="+d,test_completely_invisible,test_invisible_index";
 CREATE TABLE t2 LIKE t1;
 SET debug_dbug= DEFAULT;
 DROP TABLE t1, t2;
+#
+# MDEV-20210
+# If you have an INVISIBLE VIRTUAL column, SHOW CREATE TABLE doesn't list it as INVISIBLE
+#
+CREATE TABLE t1 (i INT, v int GENERATED ALWAYS AS (1) VIRTUAL INVISIBLE);
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `i` int(11) DEFAULT NULL,
+  `v` int(11) GENERATED ALWAYS AS (1) VIRTUAL INVISIBLE
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;

mysql-test/main/invisible_field_debug.test

@@ -278,3 +278,12 @@ SET debug_dbug="+d,test_completely_invisible,test_invisible_index";
 CREATE TABLE t2 LIKE t1;
 SET debug_dbug= DEFAULT;
 DROP TABLE t1, t2;
+
+--echo #
+--echo # MDEV-20210
+--echo # If you have an INVISIBLE VIRTUAL column, SHOW CREATE TABLE doesn't list it as INVISIBLE
+--echo #
+
+CREATE TABLE t1 (i INT, v int GENERATED ALWAYS AS (1) VIRTUAL INVISIBLE);
+SHOW CREATE TABLE t1;
+DROP TABLE t1;

sql/sql_show.cc

@@ -2256,6 +2256,10 @@ int show_create_table(THD *thd, TABLE_LIST *table_list, String *packet,
         packet->append(STRING_WITH_LEN(" STORED"));
       else
         packet->append(STRING_WITH_LEN(" VIRTUAL"));
+      if (field->invisible == INVISIBLE_USER)
+      {
+        packet->append(STRING_WITH_LEN(" INVISIBLE"));
+      }
     }
     else
     {