MDEV-34491 Setting log_slow_admin="" at startup should be converted to log_slow_admin=ALL

We have an issue if a user have the following in a configuration file:
log_slow_filter=""                  # Log everything to slow query log
log_queries_not_using_indexes=ON

This set log_slow_filter to 'not_using_index' which disables
slow_query_logging of most queries.
In effect, on should never use log_slow_filter="" in config files but
instead use log_slow_filter=ALL.

Fixed by changing log_slow_filter="" that comes either from a
configuration file or from the command line, when starting to the server,
to log_slow_filter=ALL.
A warning will be printed when this happens.

Other things:
- One can now use =ALL for any 'set' variable to set all options at once.
  (backported from 10.6)

mysql-test/main/log_slow_filter.opt

+--log-slow-filter= --log_queries_not_using_indexes=0
+
+
+

mysql-test/main/log_slow_filter.result

+call mtr.add_suppression("log_slow_filter=\"\" changed to log_slow_filter=ALL");
+show variables like "log_slow_filter";
+Variable_name	Value
+log_slow_filter	admin,filesort,filesort_on_disk,filesort_priority_queue,full_join,full_scan,query_cache,query_cache_miss,tmp_table,tmp_table_on_disk
+set @@log_slow_filter="all";
+show variables like "log_slow_filter";
+Variable_name	Value
+log_slow_filter	admin,filesort,filesort_on_disk,filesort_priority_queue,full_join,full_scan,not_using_index,query_cache,query_cache_miss,tmp_table,tmp_table_on_disk

mysql-test/main/log_slow_filter.test

+# Test setting log_slow_filter to empty in config files
+
+call mtr.add_suppression("log_slow_filter=\"\" changed to log_slow_filter=ALL");
+
+show variables like "log_slow_filter";
+set @@log_slow_filter="all";
+show variables like "log_slow_filter";

mysql-test/main/mysqld--help.result

@@ -496,10 +496,10 @@ The following specify which files/extra groups are read (specified before remain
  combination of: admin, call, slave, sp
  --log-slow-filter=name 
  Log only certain types of queries to the slow log. If
- variable empty alll kind of queries are logged.  All
- types are bound by slow_query_time, except
- 'not_using_index' which is always logged if enabled. Any
- combination of: admin, filesort, filesort_on_disk, 
+ variable empty all kind of queries are logged.  All types
+ are bound by slow_query_time, except 'not_using_index'
+ which is always logged if enabled. Any combination of: 
+ admin, filesort, filesort_on_disk, 
  filesort_priority_queue, full_join, full_scan, 
  not_using_index, query_cache, query_cache_miss, tmp_table,
  tmp_table_on_disk

mysql-test/suite/sys_vars/r/sysvars_server_embedded.result

@@ -1675,7 +1675,7 @@ COMMAND_LINE_ARGUMENT	REQUIRED
 VARIABLE_NAME	LOG_SLOW_FILTER
 VARIABLE_SCOPE	SESSION
 VARIABLE_TYPE	SET
-VARIABLE_COMMENT	Log only certain types of queries to the slow log. If variable empty alll kind of queries are logged.  All types are bound by slow_query_time, except 'not_using_index' which is always logged if enabled
+VARIABLE_COMMENT	Log only certain types of queries to the slow log. If variable empty all kind of queries are logged.  All types are bound by slow_query_time, except 'not_using_index' which is always logged if enabled
 NUMERIC_MIN_VALUE	NULL
 NUMERIC_MAX_VALUE	NULL
 NUMERIC_BLOCK_SIZE	NULL

mysql-test/suite/sys_vars/r/sysvars_server_notembedded.result

@@ -1815,7 +1815,7 @@ COMMAND_LINE_ARGUMENT	REQUIRED
 VARIABLE_NAME	LOG_SLOW_FILTER
 VARIABLE_SCOPE	SESSION
 VARIABLE_TYPE	SET
-VARIABLE_COMMENT	Log only certain types of queries to the slow log. If variable empty alll kind of queries are logged.  All types are bound by slow_query_time, except 'not_using_index' which is always logged if enabled
+VARIABLE_COMMENT	Log only certain types of queries to the slow log. If variable empty all kind of queries are logged.  All types are bound by slow_query_time, except 'not_using_index' which is always logged if enabled
 NUMERIC_MIN_VALUE	NULL
 NUMERIC_MAX_VALUE	NULL
 NUMERIC_BLOCK_SIZE	NULL

mysys/my_getopt.c

@@ -802,15 +802,21 @@ static int setval(const struct my_option *opts, void *value, char *argument,
       *((ulonglong*)value)= find_typeset(argument, opts->typelib, &err);
       if (err)
       {
-        /* Accept an integer representation of the set */
-        char *endptr;
-        ulonglong arg= (ulonglong) strtol(argument, &endptr, 10);
-        if (*endptr || (arg >> 1) >= (1ULL << (opts->typelib->count-1)))
+        /* Check if option 'all' is used (to set all bits) */
+        if (!my_strcasecmp(&my_charset_latin1, argument, "all"))
+          *(ulonglong*) value= ((1ULL << opts->typelib->count) - 1);
+        else
         {
-          res= EXIT_ARGUMENT_INVALID;
-          goto ret;
-        };
-        *(ulonglong*)value= arg;
+          /* Accept an integer representation of the set */
+          char *endptr;
+          ulonglong arg= (ulonglong) strtol(argument, &endptr, 10);
+          if (*endptr || (arg >> 1) >= (1ULL << (opts->typelib->count-1)))
+          {
+            res= EXIT_ARGUMENT_INVALID;
+            goto ret;
+          };
+          *(ulonglong*)value= arg;
+        }
         err= 0;
       }
       break;

sql/mysqld.cc

@@ -8294,6 +8294,14 @@ mysqld_get_one_option(const struct my_option *opt, const char *argument,
     if (argument == NULL) /* no argument */
       log_error_file_ptr= const_cast<char*>("");
     break;
+  case OPT_LOG_SLOW_FILTER:
+    if (argument == NULL || *argument == 0)
+    {
+      /* By default log_slow_filter_has all values except QPLAN_NOT_USING_INDEX */
+      global_system_variables.log_slow_filter= opt->def_value | QPLAN_NOT_USING_INDEX;
+      sql_print_warning("log_slow_filter=\"\" changed to log_slow_filter=ALL");
+    }
+    break;
   case OPT_IGNORE_DB_DIRECTORY:
     opt_ignore_db_dirs= NULL; // will be set in ignore_db_dirs_process_additions
     if (*argument == 0)

sql/mysqld.h

@@ -789,6 +789,7 @@ enum options_mysqld
   OPT_KEY_CACHE_CHANGED_BLOCKS_HASH_SIZE,
   OPT_LOG_BASENAME,
   OPT_LOG_ERROR,
+  OPT_LOG_SLOW_FILTER,
   OPT_LOWER_CASE_TABLE_NAMES,
   OPT_PLUGIN_LOAD,
   OPT_PLUGIN_LOAD_ADD,

sql/sys_vars.cc

@@ -6280,8 +6280,9 @@ static const char *log_slow_filter_names[]=
 
 static Sys_var_set Sys_log_slow_filter(
        "log_slow_filter",
-       "Log only certain types of queries to the slow log. If variable empty alll kind of queries are logged.  All types are bound by slow_query_time, except 'not_using_index' which is always logged if enabled",
-       SESSION_VAR(log_slow_filter), CMD_LINE(REQUIRED_ARG),
+       "Log only certain types of queries to the slow log. If variable empty all kind of queries are logged.  All types are bound by slow_query_time, except 'not_using_index' which is always logged if enabled",
+       SESSION_VAR(log_slow_filter), CMD_LINE(REQUIRED_ARG,
+                                              OPT_LOG_SLOW_FILTER),
        log_slow_filter_names,
        /* by default we log all queries except 'not_using_index' */
        DEFAULT(my_set_bits(array_elements(log_slow_filter_names)-1) &

sql/sys_vars.inl

@@ -1379,6 +1379,10 @@ class Sys_var_flagset: public Sys_var_typelib
 
   Backing store: ulonglong
 */
+
+static const LEX_CSTRING all_clex_str= {STRING_WITH_LEN("all")};
+
+
 class Sys_var_set: public Sys_var_typelib
 {
 public:
@@ -1438,6 +1442,13 @@ class Sys_var_set: public Sys_var_typelib
       var->save_result.ulonglong_value=
             find_set(&typelib, res->ptr(), res->length(), NULL,
                     &error, &error_len, &not_used);
+      if (error_len &&
+          !my_charset_latin1.strnncollsp(res->ptr(), res->length(),
+                                         all_clex_str.str, all_clex_str.length))
+      {
+        var->save_result.ulonglong_value= ((1ULL << (typelib.count)) -1);
+        error_len= 0;
+      }
       /*
         note, we only issue an error if error_len > 0.
         That is even while empty (zero-length) values are considered