WL1368: SHOW GRANTS FOR CURRENT USER

  'SHOW GRANTS' syntax is added 
  'SHOW GRANTS FOR CURRENT_USER' syntax is added
  'SHOW GRANTS FOR CURRENT_USER()' syntax is added
 CURRENT_USER without parens in expressions(SELECT CURRENT_USER;) 

mysql-test/r/grant2.result

@@ -5,6 +5,9 @@ grant all privileges on `my\_%`.* to mysqltest_1@localhost with grant option;
 select current_user();
 current_user()
 mysqltest_1@localhost
+select current_user;
+current_user
+mysqltest_1@localhost
 grant all privileges on `my\_1`.* to mysqltest_2@localhost with grant option;
 grant all privileges on `my_%`.* to mysqltest_3@localhost with grant option;
 ERROR 42000: Access denied for user: 'mysqltest_1'@'localhost' to database 'my_%'

mysql-test/r/grant_cache.result

@@ -2,6 +2,12 @@ drop table if exists test.t1,mysqltest.t1,mysqltest.t2;
 drop database if exists mysqltest;
 reset query cache;
 flush status;
+show grants for current_user;
+Grants for root@localhost
+GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' WITH GRANT OPTION
+show grants;
+Grants for root@localhost
+GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' WITH GRANT OPTION
 create database if not exists mysqltest;
 create table mysqltest.t1 (a int,b int,c int);
 create table mysqltest.t2 (a int,b int,c int);
@@ -41,6 +47,10 @@ grant SELECT on mysqltest.* to mysqltest_1@localhost;
 grant SELECT on mysqltest.t1 to mysqltest_2@localhost;
 grant SELECT on test.t1 to mysqltest_2@localhost;
 grant SELECT(a) on mysqltest.t1 to mysqltest_3@localhost;
+show grants for current_user();
+Grants for mysqltest_1@localhost
+GRANT USAGE ON *.* TO 'mysqltest_1'@'localhost'
+GRANT SELECT ON `mysqltest`.* TO 'mysqltest_1'@'localhost'
 show status like "Qcache_queries_in_cache";
 Variable_name	Value
 Qcache_queries_in_cache	6
@@ -101,6 +111,9 @@ Qcache_hits	3
 show status like "Qcache_not_cached";
 Variable_name	Value
 Qcache_not_cached	1
+show grants for current_user();
+Grants for @localhost
+GRANT USAGE ON *.* TO ''@'localhost'
 select "user2";
 user2
 user2
@@ -158,6 +171,10 @@ Qcache_not_cached	7
 select "user4";
 user4
 user4
+show grants;
+Grants for mysqltest_1@localhost
+GRANT USAGE ON *.* TO 'mysqltest_1'@'localhost'
+GRANT SELECT ON `mysqltest`.* TO 'mysqltest_1'@'localhost'
 select a from t1;
 ERROR 3D000: No Database Selected
 select * from mysqltest.t1,test.t1;

mysql-test/t/grant2.test

@@ -15,6 +15,7 @@ grant all privileges on `my\_%`.* to mysqltest_1@localhost with grant option;
 connect (user1,localhost,mysqltest_1,,);
 connection user1;
 select current_user();
+select current_user;
 grant all privileges on `my\_1`.* to mysqltest_2@localhost with grant option;
 --error 1044
 grant all privileges on `my_%`.* to mysqltest_3@localhost with grant option;

mysql-test/t/grant_cache.test

@@ -12,6 +12,8 @@ reset query cache;
 flush status;
 connect (root,localhost,root,,test,$MASTER_MYPORT,master.sock);
 connection root;
+show grants for current_user;
+show grants;
 --disable_warnings
 create database if not exists mysqltest;
 --enable_warnings
@@ -43,6 +45,7 @@ grant SELECT(a) on mysqltest.t1 to mysqltest_3@localhost;
 # The following queries should be fetched from cache
 connect (user1,localhost,mysqltest_1,,mysqltest,$MASTER_MYPORT,master.sock);
 connection user1;
+show grants for current_user();
 show status like "Qcache_queries_in_cache";
 show status like "Qcache_hits";
 show status like "Qcache_not_cached";
@@ -64,6 +67,10 @@ show status like "Qcache_queries_in_cache";
 show status like "Qcache_hits";
 show status like "Qcache_not_cached";
 
+connect (unkuser,localhost,,,,$MASTER_MYPORT,master.sock);
+connection unkuser;
+show grants for current_user();
+
 # The following queries should be fetched from cache
 connect (user2,localhost,mysqltest_2,,mysqltest,$MASTER_MYPORT,master.sock);
 connection user2;
@@ -104,6 +111,7 @@ show status like "Qcache_not_cached";
 connect (user4,localhost,mysqltest_1,,*NO-ONE*,$MASTER_MYPORT,master.sock);
 connection user4;
 select "user4";
+show grants;
 --error 1046
 select a from t1;
 # The following query is not cached before (different database)

sql/lex.h

@@ -122,6 +122,7 @@ static SYMBOL symbols[] = {
   { "CURRENT_DATE",	SYM(CURDATE)},
   { "CURRENT_TIME",	SYM(CURTIME)},
   { "CURRENT_TIMESTAMP", SYM(NOW_SYM)},
+  { "CURRENT_USER",	SYM(CURRENT_USER)},
   { "DATA",		SYM(DATA_SYM)},
   { "DATABASE",		SYM(DATABASE)},
   { "DATABASES",	SYM(DATABASES)},
@@ -481,7 +482,6 @@ static SYMBOL sql_functions[] = {
   { "CAST",		SYM(CAST_SYM)},
   { "CEIL",		F_SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_ceiling)},
   { "CEILING",		F_SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_ceiling)},
-  { "CURRENT_USER",	F_SYM(FUNC_ARG0),0,CREATE_FUNC(create_func_current_user)},
   { "BIT_LENGTH",	F_SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_bit_length)},
   { "CENTROID",		F_SYM(FUNC_ARG1),0,CREATE_FUNC_GEOM(create_func_centroid)},
   { "CHAR_LENGTH",	F_SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_char_length)},

sql/sql_yacc.yy

@@ -210,6 +210,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b,int *yystacksize);
 %token	CONCURRENT
 %token	CONSTRAINT
 %token	CONVERT_SYM
+%token  CURRENT_USER
 %token	DATABASES
 %token	DATA_SYM
 %token	DEFAULT
@@ -721,7 +722,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b,int *yystacksize);
 	union_clause union_list
 	precision subselect_start opt_and charset
 	subselect_end select_var_list select_var_list_init help opt_len
-	opt_extended_describe
+	opt_extended_describe curr_user
 END_OF_INPUT
 
 %type <NONE>
@@ -2684,6 +2685,8 @@ simple_expr:
 	    $$= new Item_func_curtime_local($3);
 	    Lex->safe_to_cache_query=0;
 	  }
+	| curr_user
+          { $$= create_func_current_user(); }
 	| DATE_ADD_INTERVAL '(' expr ',' interval_expr interval ')'
 	  { $$= new Item_date_add_interval($3,$5,$6,0); }
 	| DATE_SUB_INTERVAL '(' expr ',' interval_expr interval ')'
@@ -4170,6 +4173,29 @@ show_param:
 	  { Lex->sql_command= SQLCOM_SHOW_LOGS; WARN_DEPRECATED("SHOW BDB LOGS", "SHOW ENGINE BDB LOGS"); }
 	| LOGS_SYM
 	  { Lex->sql_command= SQLCOM_SHOW_LOGS; WARN_DEPRECATED("SHOW LOGS", "SHOW ENGINE BDB LOGS"); }
+	| GRANTS
+	  {
+	    LEX *lex=Lex;
+	    lex->sql_command= SQLCOM_SHOW_GRANTS;
+	    THD *thd= lex->thd;
+	    LEX_USER *curr_user;
+            if (!(curr_user= (LEX_USER*) thd->alloc(sizeof(st_lex_user))))
+              YYABORT;
+            curr_user->user.str= thd->priv_user;
+            curr_user->user.length= strlen(thd->priv_user);
+            if (*thd->priv_host != 0)
+            {
+              curr_user->host.str= thd->priv_host;
+              curr_user->host.length= strlen(thd->priv_host);
+            }
+            else
+            {
+              curr_user->host.str= (char *) "%";
+              curr_user->host.length= 1;
+            }
+            curr_user->password.str=NullS;
+	    lex->grant_user= curr_user;
+	  }
 	| GRANTS FOR_SYM user
 	  {
 	    LEX *lex=Lex;
@@ -4744,6 +4770,11 @@ ident_or_text:
 	| TEXT_STRING_sys	{ $$=$1;}
 	| LEX_HOSTNAME		{ $$=$1;};
 
+curr_user: 
+        CURRENT_USER		{;}
+        | CURRENT_USER '(' ')'	{;}
+        ;
+
 user:
 	ident_or_text
 	{
@@ -4760,7 +4791,25 @@ user:
 	    if (!($$=(LEX_USER*) thd->alloc(sizeof(st_lex_user))))
 	      YYABORT;
 	    $$->user = $1; $$->host=$3;
-	  };
+	  }
+	| curr_user
+	{
+          THD *thd= YYTHD;
+          if (!($$=(LEX_USER*) thd->alloc(sizeof(st_lex_user))))
+            YYABORT;
+          $$->user.str= thd->priv_user;
+          $$->user.length= strlen(thd->priv_user);
+          if (*thd->priv_host != 0)
+          {
+            $$->host.str= thd->priv_host;
+            $$->host.length= strlen(thd->priv_host);
+          }
+          else
+          {
+            $$->host.str= (char *) "%";
+            $$->host.length= 1;
+          }
+	};
 
 /* Keyword that we allow for identifiers */
 
@@ -4798,6 +4847,7 @@ keyword:
 	| COMPRESSED_SYM	{}
 	| CONCURRENT		{}
 	| CUBE_SYM		{}
+	| CURRENT_USER		{}
 	| DATA_SYM		{}
 	| DATETIME		{}
 	| DATE_SYM		{}