MDEV-32751 sys schema view session_ssl_status is empty

* treat FUNC/ARRAY variables as SESSION (otherwise they won't be shown)
* allow SHOW_SIMPLE_FUNC everywhere where SHOW_FUNC is
* increase row buffer size to avoid "too short" assert

mysql-test/main/ssl.result

 connect  ssl_con,localhost,root,,,,,SSL;
+select variable_name from performance_schema.status_by_thread where VARIABLE_NAME LIKE 'Ssl%';
+variable_name
+Ssl_cipher
+Ssl_cipher_list
+Ssl_default_timeout
+Ssl_server_not_after
+Ssl_server_not_before
+Ssl_verify_depth
+Ssl_verify_mode
+Ssl_version
+Ssl_cipher
+Ssl_cipher_list
+Ssl_default_timeout
+Ssl_server_not_after
+Ssl_server_not_before
+Ssl_verify_depth
+Ssl_verify_mode
+Ssl_version
 SELECT (VARIABLE_VALUE <> '') AS have_ssl FROM INFORMATION_SCHEMA.SESSION_STATUS WHERE VARIABLE_NAME='Ssl_cipher';
 have_ssl
 1

mysql-test/main/ssl.test

@@ -13,6 +13,8 @@
 
 connect (ssl_con,localhost,root,,,,,SSL);
 
+select variable_name from performance_schema.status_by_thread where VARIABLE_NAME LIKE 'Ssl%';
+
 # Check ssl turned on
 SELECT (VARIABLE_VALUE <> '') AS have_ssl FROM INFORMATION_SCHEMA.SESSION_STATUS WHERE VARIABLE_NAME='Ssl_cipher';
 

storage/perfschema/pfs_variable.cc

@@ -66,7 +66,7 @@ static inline SHOW_SCOPE show_scope_from_type(enum enum_mysql_show_type type)
     case SHOW_SIMPLE_FUNC:
     case SHOW_UNDEF:
     default:
-      return SHOW_SCOPE_UNDEF;
+      return SHOW_SCOPE_ALL;
   }
   return SHOW_SCOPE_UNDEF;
 }
@@ -716,6 +716,7 @@ bool PFS_status_variable_cache::can_aggregate(enum_mysql_show_type variable_type
     case SHOW_CHAR_PTR:
     case SHOW_ARRAY:
     case SHOW_FUNC:
+    case SHOW_SIMPLE_FUNC:
     case SHOW_INT:
     case SHOW_LONG:
     case SHOW_LONGLONG:
@@ -1152,16 +1153,19 @@ void PFS_status_variable_cache::manifest(THD *thd, const SHOW_VAR *show_var_arra
       reevaluate the new SHOW_TYPE and value. Handle nested case where
       SHOW_FUNC resolves to another SHOW_FUNC.
     */
-    if (show_var_ptr->type == SHOW_FUNC)
+    if (show_var_ptr->type == SHOW_FUNC || show_var_ptr->type == SHOW_SIMPLE_FUNC)
     {
       show_var_tmp= *show_var_ptr;
       /*
         Execute the function reference in show_var_tmp->value, which returns
         show_var_tmp with a new type and new value.
       */
-      for (const SHOW_VAR *var= show_var_ptr; var->type == SHOW_FUNC; var= &show_var_tmp)
+      for (const SHOW_VAR *var= show_var_ptr;
+           var->type == SHOW_FUNC || var->type == SHOW_SIMPLE_FUNC;
+           var= &show_var_tmp)
       {
-        ((mysql_show_var_func)(var->value))(thd, &show_var_tmp, value_buf.data, NULL, m_query_scope);
+        ((mysql_show_var_func)(var->value))(thd, &show_var_tmp, value_buf.data,
+                                            &thd->status_var, m_query_scope);
       }
       show_var_ptr= &show_var_tmp;
     }

storage/perfschema/table_helper.h

@@ -659,7 +659,7 @@ struct PFS_variable_value_row
 private:
   void make_row(const CHARSET_INFO *cs, const char* str, size_t length);
 
-  char m_str[1024];
+  char m_str[2048];
   uint m_length;
   const CHARSET_INFO *m_charset;
 };