MDEV-26142: Fix failures of the tests main.features and sys_vars.stored_program_cache_func when they are run in PS mode

These tests produced different results in case they were run
with the option --ps-protocol.

These tests produced different result sets since a value of
Feature_subquery and handler_read_key status system variables
are updated one time more for ps-protocol (the first time it is updated
on Prepare phase and the second time on Execute phase of PS protocol)
So different result sets are expected for both tests. To make tests
successfully runnable both for case it is run with and without
the option --ps-protocol the new protocol combination [ps, nm]
and protocol specific result files have been added.

Moreover, the perl script mysql-test/mariadb-test-run.pl
has been updated to make the variable opt_ps_protocol visible
outside perl file containing this variable.

mysql-test/include/protocol.combinations

@@ -0,0 +1,3 @@
+[nm]
+
+[ps]

mysql-test/include/protocol.inc

@@ -0,0 +1,2 @@
+# The goal of including this file is to enable protocol
+# combinations (see include/protocol.combinations)

mysql-test/main/features,ps.rdiff

@@ -0,0 +1,21 @@
+--- features.result
++++ features,ps.result
+@@ -46,7 +46,7 @@
+ 1212
+ show status like "feature_dynamic_columns";
+ Variable_name	Value
+-Feature_dynamic_columns	2
++Feature_dynamic_columns	4
+ #
+ # Feature fulltext
+ #
+@@ -93,7 +93,7 @@
+ drop table t1;
+ show status like "feature_subquery";
+ Variable_name	Value
+-Feature_subquery	4
++Feature_subquery	5
+ #
+ # Feature timezone
+ #
+

mysql-test/main/features.test

@@ -1,10 +1,7 @@
 # Testing of feature statistics
-if (`SELECT $PS_PROTOCOL != 0`)
-{
-   --skip Test temporarily disabled for ps-protocol
-}
 
 -- source include/have_geometry.inc
+-- source include/protocol.inc
 
 --disable_warnings
 drop table if exists t1;

mysql-test/mariadb-test-run.pl

@@ -244,7 +244,7 @@ my $opt_ssl;
 my $opt_skip_ssl;
 my @opt_skip_test_list;
 our $opt_ssl_supported;
-my $opt_ps_protocol;
+our $opt_ps_protocol;
 my $opt_sp_protocol;
 my $opt_cursor_protocol;
 my $opt_view_protocol;

mysql-test/suite.pm

@@ -25,6 +25,12 @@ sub skip_combinations {
     $skip{'include/platform.combinations'} = [ 'aix', 'win' ];
   }
 
+  if ( $::opt_ps_protocol ) {
+    $skip{'include/protocol.combinations'} = [ 'nm' ];
+  } else {
+    $skip{'include/protocol.combinations'} = [ 'ps' ];
+  }
+
   $skip{'include/maybe_debug.combinations'} =
     [ defined $::mysqld_variables{'debug-dbug'} ? 'release' : 'debug' ];
 

mysql-test/suite/sys_vars/r/stored_program_cache_func,ps.rdiff

@@ -0,0 +1,18 @@
+--- stored_program_cache_func.result
++++ stored_program_cache_func,ps.result
+@@ -21,13 +21,13 @@
+ 1
+ show status like 'handler_read_key';
+ Variable_name	Value
+-Handler_read_key	2
++Handler_read_key	3
+ call p1;
+ 1
+ 1
+ show status like 'handler_read_key';
+ Variable_name	Value
+-Handler_read_key	3
++Handler_read_key	5
+ drop procedure p1;
+ set global stored_program_cache=default;
+ create procedure pr(i int) begin

mysql-test/suite/sys_vars/t/stored_program_cache_func.test

@@ -1,7 +1,5 @@
-if (`SELECT $PS_PROTOCOL != 0`)
-{
-   --skip Test temporarily disabled for ps-protocol
-}
+--source include/protocol.inc
+
 create procedure p1() select 1;
 
 flush status;