Fix for bug #7210: information_schema: can't access when table-name = reserved word

mysql-test/r/information_schema.result

@@ -590,6 +590,23 @@ TABLES
 TABLE_PRIVILEGES
 TABLE_CONSTRAINTS
 TABLE_NAMES
+select table_name from tables where table_name='user';
+table_name
+user
+select column_name, privileges from columns
+where table_name='user' and column_name like '%o%';
+column_name	privileges
+Host	select,insert,update,references
+Password	select,insert,update,references
+Drop_priv	select,insert,update,references
+Reload_priv	select,insert,update,references
+Shutdown_priv	select,insert,update,references
+Process_priv	select,insert,update,references
+Show_db_priv	select,insert,update,references
+Lock_tables_priv	select,insert,update,references
+Show_view_priv	select,insert,update,references
+max_questions	select,insert,update,references
+max_connections	select,insert,update,references
 use test;
 create function sub1(i int) returns int
 return i+1;

mysql-test/t/information_schema.test

@@ -293,6 +293,13 @@ show tables;
 use information_schema;
 show tables like "T%";
 
+#
+# Bug#7210: information_schema: can't access when table-name = reserved word
+#
+select table_name from tables where table_name='user';
+select column_name, privileges from columns
+where table_name='user' and column_name like '%o%';
+
 #
 # Bug#7212: information_schema: "Can't find file" errors if storage engine gone
 # Bug#7211: information_schema: crash if bad view

sql/sql_parse.cc

@@ -1583,6 +1583,15 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
 			packet, (uint) (pend-packet), thd->charset());
     table_list.alias= table_list.real_name= conv_name.str;
     packet= pend+1;
+
+    if (!my_strcasecmp(system_charset_info, table_list.db,
+                       information_schema_name.str))
+    {
+      ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, table_list.alias);
+      if (schema_table)
+        table_list.schema_table= schema_table;
+    }
+
     /*  command not cachable => no gap for data base name */
     if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1)))
       break;

sql/sql_yacc.yy

@@ -6885,6 +6885,7 @@ keyword:
 	| CLIENT_SYM		{}
 	| CLOSE_SYM		{}
 	| COLLATION_SYM		{}
+        | COLUMNS               {}
 	| COMMENT_SYM		{}
 	| COMMITTED_SYM		{}
 	| COMMIT_SYM		{}
@@ -7006,6 +7007,7 @@ keyword:
 	| POLYGON		{}
         | PREPARE_SYM           {}
 	| PREV_SYM		{}
+        | PRIVILEGES            {}
 	| PROCESS		{}
 	| PROCESSLIST_SYM	{}
 	| QUARTER_SYM		{}
@@ -7057,6 +7059,7 @@ keyword:
 	| SUBDATE_SYM		{}
 	| SUBJECT_SYM		{}
 	| SUPER_SYM		{}
+        | TABLES                {}
 	| TABLESPACE		{}
 	| TEMPORARY		{}
 	| TEMPTABLE_SYM		{}