MDEV-34860 Fix opt_hint_timeout.test for embedded; fix mariadb client

1. Disable opt_hint_timeout.test for embedded server. Make sure
the test does not crash even when started for embedded server.
Disable view-protocol since hints are not supported inside views.

2. Hints are designed to behave like regular /* ... */ comments:
   `SELECT /*+ " */ 1;` -- a valid SQL query
However, the mysql client program waits for the closing doublequote
character.
Another problem is observed when there is no space character between
closing `*/` of the hint and the following `*`:
   `SELECT /*+ some_hints(...) */* FROM t1;`
In this case the client treats `/*` as a comment section opening and
waits for the closing `*/` sequence.

This commit fixes all of these issues

client/mysql.cc

@@ -236,6 +236,8 @@ static char **defaults_argv;
 enum enum_info_type { INFO_INFO,INFO_ERROR,INFO_RESULT};
 typedef enum enum_info_type INFO_TYPE;
 
+enum ss_comment_type { SSC_NONE= 0, SSC_CONDITIONAL, SSC_HINT };
+
 static MYSQL mysql;			/* The connection */
 static my_bool ignore_errors=0,wait_flag=0,quick=0,
                connected=0,opt_raw_data=0,unbuffered=0,output_tables=0,
@@ -1159,7 +1161,8 @@ static void fix_history(String *final_command);
 
 static COMMANDS *find_command(char *name);
 static COMMANDS *find_command(char cmd_name);
-static bool add_line(String &, char *, size_t line_length, char *, bool *, bool);
+static bool add_line(String &, char *, size_t line_length, char *,
+                     bool *, ss_comment_type *, bool);
 static void remove_cntrl(String &buffer);
 static void print_table_data(MYSQL_RES *result);
 static void print_table_data_html(MYSQL_RES *result);
@@ -2212,6 +2215,7 @@ static int read_and_execute(bool interactive)
   char	in_string=0;
   ulong line_number=0;
   bool ml_comment= 0;  
+  ss_comment_type ss_comment= SSC_NONE;
   COMMANDS *com;
   size_t line_length= 0;
   status.exit_status=1;
@@ -2358,7 +2362,8 @@ static int read_and_execute(bool interactive)
 #endif
       continue;
     }
-    if (add_line(glob_buffer, line, line_length, &in_string, &ml_comment,
+    if (add_line(glob_buffer, line, line_length, &in_string,
+                 &ml_comment, &ss_comment,
                  status.line_buff ? status.line_buff->truncated : 0))
       break;
   }
@@ -2527,13 +2532,13 @@ static COMMANDS *find_command(char *name)
 
 
 static bool add_line(String &buffer, char *line, size_t line_length,
-                     char *in_string, bool *ml_comment, bool truncated)
+                     char *in_string, bool *ml_comment,
+                     ss_comment_type *ss_comment, bool truncated)
 {
   uchar inchar;
   char buff[80], *pos, *out;
   COMMANDS *com;
   bool need_space= 0;
-  bool ss_comment= 0;
   DBUG_ENTER("add_line");
 
   if (!line[0] && buffer.is_empty())
@@ -2608,7 +2613,7 @@ static bool add_line(String &buffer, char *line, size_t line_length,
           DBUG_RETURN(1);                       // Quit
         if (com->takes_params)
         {
-          if (ss_comment)
+          if (*ss_comment != SSC_NONE)
           {
             /*
               If a client-side macro appears inside a server-side comment,
@@ -2642,7 +2647,8 @@ static bool add_line(String &buffer, char *line, size_t line_length,
 	continue;
       }
     }
-    else if (!*ml_comment && !*in_string && is_prefix(pos, delimiter))
+    else if (!*ml_comment && !*in_string && *ss_comment != SSC_HINT &&
+             is_prefix(pos, delimiter))
     {
       // Found a statement. Continue parsing after the delimiter
       pos+= delimiter_length;
@@ -2731,9 +2737,8 @@ static bool add_line(String &buffer, char *line, size_t line_length,
       break;
     }
     else if (!*in_string && inchar == '/' && pos[1] == '*' &&
-             !(pos[2] == '!' ||
+             pos[2] != '!' && !(pos[2] == 'M' && pos[3] == '!') &&
-               (pos[2] == 'M' && pos[3] == '!') ||
+             pos[2] != '+' && *ss_comment != SSC_HINT)
-               pos[2] == '+'))
     {
       if (preserve_comments)
       {
@@ -2749,7 +2754,8 @@ static bool add_line(String &buffer, char *line, size_t line_length,
         out=line;
       }
     }
-    else if (*ml_comment && !ss_comment && inchar == '*' && *(pos + 1) == '/')
+    else if (*ml_comment && *ss_comment == SSC_NONE &&
+             inchar == '*' && *(pos + 1) == '/')
     {
       if (preserve_comments)
       {
@@ -2770,14 +2776,24 @@ static bool add_line(String &buffer, char *line, size_t line_length,
     }      
     else
     {						// Add found char to buffer
-      if (!*in_string && inchar == '/' && pos[1] == '*' &&
+      if (!*in_string && inchar == '/' && pos[1] == '*')
-          (pos[2] == '!' || pos[2] == '+'))
+      {
-        ss_comment= 1;
+        if (pos[2] == '!')
-      else if (!*in_string && ss_comment && inchar == '*' && *(pos + 1) == '/')
+          *ss_comment= SSC_CONDITIONAL;
-        ss_comment= 0;
+        else if (pos[2] == '+')
+          *ss_comment= SSC_HINT;
+      }
+      else if (!*in_string && *ss_comment != SSC_NONE &&
+               inchar == '*' && *(pos + 1) == '/')
+      {
+        *ss_comment= SSC_NONE;
+        *out++= *pos++;                       // copy '*'
+        *out++= *pos;                         // copy '/'
+        continue;
+      }
       if (inchar == *in_string)
 	*in_string= 0;
-      else if (!*ml_comment && !*in_string &&
+      else if (!*ml_comment && !*in_string && *ss_comment != SSC_HINT &&
 	       (inchar == '\'' || inchar == '"' || inchar == '`'))
 	*in_string= (char) inchar;
       if (!*ml_comment || preserve_comments)

mysql-test/main/mysql_comments.result

@@ -33,6 +33,14 @@ Trigger	sql_mode	SQL Original Statement	character_set_client	collation_connectio
 t1_bi		CREATE DEFINER=`root`@`localhost` trigger t1_bi before insert on t1\nfor each row\nbegin\n\n\n\n  \n  declare b int;\n  declare c float;\n\n  \n  \n\n  \n  set NEW.data := 12;\nend	latin1	latin1_swedish_ci	utf8mb4_uca1400_ai_ci	--TIME--
 id	data
 trig	12
+id	data
+trig	12
+id	data
+trig	12
+id	data
+trig	12
+id	data
+trig	12
 "Pass 2 : --enable-comments"
 1
 1
@@ -60,5 +68,13 @@ Trigger	sql_mode	SQL Original Statement	character_set_client	collation_connectio
 t1_bi		CREATE DEFINER=`root`@`localhost` trigger t1_bi before insert on t1\nfor each row\nbegin\n# comment 1a\n-- comment 1b\n/*\n   comment 1c\n*/\n  -- declare some variables here\n  declare b int;\n  declare c float;\n\n  -- do more stuff here\n  -- commented nicely and so on\n\n  -- famous last words ...\n  set NEW.data := 12;\nend	latin1	latin1_swedish_ci	utf8mb4_uca1400_ai_ci	--TIME--
 id	data
 trig	12
+id	data
+trig	12
+id	data
+trig	12
+id	data
+trig	12
+id	data
+trig	12
 set global sql_mode=default;
 End of 5.0 tests

mysql-test/main/mysql_comments.sql

@@ -211,6 +211,18 @@ show create trigger t1_bi;
 insert into t1(id) value ("trig");
 select * from t1;
 
+##============================================================================
+## Optimizer hints
+##============================================================================
+
+select /*+ no_icp(t1)*/* from t1;
+select /*+ no_icp(t1) " ;,` */* from t1;
+select /*+ "some text" */* from t1;
+
+select /* no_icp(t1)
+no_bka(t1)
+*/* from t1;
+
 ##============================================================================
 ## Cleanup
 ##============================================================================

mysql-test/main/opt_hint_timeout.test

@@ -1,6 +1,11 @@
+# Setting statement time-outs is not possible for the embedded server neither
+# by SET STATEMENT max_statement_time=X nor by /*+ MAX_EXECUTION_TIME(X)*/ hint.
+# That is why this test is disabled for the embedded server
 --source include/not_embedded.inc
---source include/have_sequence.inc
 
+--disable_view_protocol # Since optimizer hints are not supported inside views
+
+--source include/have_sequence.inc
 --echo #
 --echo # MAX_EXECUTION_TIME hint testing
 --echo #

sql/sql_class.h

@@ -6064,7 +6064,9 @@ public:
   }
   void set_query_timer_force(ulonglong timeout_val)
   {
+#ifndef EMBEDDED_LIBRARY
     thr_timer_settime(&query_timer, timeout_val);
+#endif
   }
   void reset_query_timer()
   {