Expose nonsuper_connections as a new status variable (#1070)

Summary:
Expose nonsuper_connections as a new status variable

Squash with D13987618

Reference Patch: a4de2e872ca

Pull Request resolved: #1070

Reviewed By: yizhang82

Differential Revision: D19161994

Pulled By: mzait

fbshipit-source-id: e6be893

Author: mzait

mysql-test/r/max_nonsuper_connections.result

@@ -7,6 +7,7 @@ SET @@global.max_nonsuper_connections = 10;
 SELECT @@global.max_nonsuper_connections;
 @@global.max_nonsuper_connections
 10
+include/assert.inc [Non_super_connections should be 0]
 connection default;
 connect  con$i, localhost, test_user,,test;
 connect  con$i, localhost, test_user,,test;
@@ -25,13 +26,19 @@ connection con_root;
 SELECT @@global.max_nonsuper_connections;
 @@global.max_nonsuper_connections
 10
+include/assert.inc [Non_super_connections should be 10]
+connection con_root;
+connection con_root;
 disconnect con_root;
 connection default;
 connect  con_super, localhost, super_user,,test;
 connection con_super;
 SELECT @@global.max_nonsuper_connections;
 @@global.max_nonsuper_connections
 10
+include/assert.inc [Non_super_connections should be 10]
+connection con_super;
+connection con_super;
 mysqltest: At line 1: Query 'change_user test_user' failed.
 ERROR 1040 (08004): Too many connections
 disconnect con_super;
@@ -89,6 +96,9 @@ SET @@global.max_nonsuper_connections = @start_value;
 SELECT @@global.max_nonsuper_connections;
 @@global.max_nonsuper_connections
 0
+include/assert.inc [Non_super_connections should be 10]
+connection default;
+connection default;
 drop user test_user@localhost;
 drop user super_user@localhost;
 disconnect con10;

mysql-test/t/max_nonsuper_connections.test

@@ -11,6 +11,9 @@ SET @start_value = @@global.max_nonsuper_connections;
 
 SET @@global.max_nonsuper_connections = 10;
 SELECT @@global.max_nonsuper_connections;
+--let $assert_text= Non_super_connections should be 0
+--let $assert_cond= "[SHOW GLOBAL STATUS like \'Non_super_connections\', Value, 1]" = "0"
+--source include/assert.inc
 
 enable_connect_log;
 connection default;
@@ -40,6 +43,10 @@ connect (con_root, localhost, root,,test);
 --echo # connection con_root
 connection con_root;
 SELECT @@global.max_nonsuper_connections;
+--let $assert_text= Non_super_connections should be 10
+--let $assert_cond= "[SHOW GLOBAL STATUS like \'Non_super_connections\', Value, 1]" = "10"
+--source include/assert.inc
+
 disconnect con_root;
 connection default;
 
@@ -49,6 +56,9 @@ connection default;
 connect (con_super, localhost, super_user,,test);
 connection con_super;
 SELECT @@global.max_nonsuper_connections;
+--let $assert_text= Non_super_connections should be 10
+--let $assert_cond= "[SHOW GLOBAL STATUS like \'Non_super_connections\', Value, 1]" = "10"
+--source include/assert.inc
 
 #
 # change admin user to regular user in the current connection will fail
@@ -129,6 +139,10 @@ enable_query_log;
 connection default;
 SET @@global.max_nonsuper_connections = @start_value;
 SELECT @@global.max_nonsuper_connections;
+--let $assert_text= Non_super_connections should be 10
+--let $assert_cond= "[SHOW GLOBAL STATUS like \'Non_super_connections\', Value, 1]" = "10"
+--source include/assert.inc
+
 drop user test_user@localhost;
 drop user super_user@localhost;
 let $i= 10;

sql/mysqld.cc

@@ -8970,6 +8970,8 @@ SHOW_VAR status_vars[] = {
      SHOW_SCOPE_GLOBAL},
     {"Max_used_connections_time", (char *)&show_max_used_connections_time,
      SHOW_FUNC, SHOW_SCOPE_GLOBAL},
+    {"Non_super_connections", (char *)&nonsuper_connections, SHOW_LONG,
+     SHOW_SCOPE_GLOBAL},
     {"Not_flushed_delayed_rows", (char *)&delayed_rows_in_use,
      SHOW_LONG_NOFLUSH, SHOW_SCOPE_GLOBAL},
     {"Open_files", (char *)&my_file_opened, SHOW_LONG_NOFLUSH,