Revert the fix for bug #47627 as it's causing the regression tests in pb2 to

fail.

mysql-test/r/sp.result

@@ -6979,51 +6979,6 @@ CALL p1;
 ERROR 42S22: Unknown column 'A.b' in 'IN/ALL/ANY subquery'
 DROP PROCEDURE p1;
 DROP TABLE t1, t2;
-#
-# Bug47627  SET @@{global.session}.local_variable in stored routine causes crash
-#
-DROP PROCEDURE IF EXISTS p1;
-DROP PROCEDURE IF EXISTS p2;
-DROP PROCEDURE IF EXISTS p3;
-CREATE PROCEDURE p1()
-BEGIN
-DECLARE v INT DEFAULT 0;
-SET @@session.v= 10;
-END//
-ERROR HY000: Unknown system variable 'v'
-CREATE PROCEDURE p2()
-BEGIN
-DECLARE v INT DEFAULT 0;
-SET v= 10;
-END//
-call p2()//
-CREATE PROCEDURE p3()
-BEGIN
-DECLARE v INT DEFAULT 0;
-SELECT @@session.v;
-END//
-ERROR HY000: Unknown system variable 'v'
-CREATE PROCEDURE p4()
-BEGIN
-DECLARE v INT DEFAULT 0;
-SET @@global.v= 10;
-END//
-ERROR HY000: Unknown system variable 'v'
-CREATE PROCEDURE p5()
-BEGIN
-DECLARE v INT DEFAULT 0;
-SET @@global.query_cache_size= 0;
-SET @@session.identity= 1;
-SELECT @@session.identity;
-SELECT @@global.query_cache_size;
-END//
-CALL p5();
-@@session.identity
-1
-@@global.query_cache_size
-0
-DROP PROCEDURE p2;
-DROP PROCEDURE p5;
 # ------------------------------------------------------------------
 # -- End of 5.1 tests
 # ------------------------------------------------------------------

mysql-test/t/sp.test

@@ -8263,51 +8263,7 @@ CALL p1;
 DROP PROCEDURE p1;
 DROP TABLE t1, t2;
 
---echo #
---echo # Bug47627  SET @@{global.session}.local_variable in stored routine causes crash
---echo #
---disable_warnings
-DROP PROCEDURE IF EXISTS p1;
-DROP PROCEDURE IF EXISTS p2;
-DROP PROCEDURE IF EXISTS p3;
---enable_warnings
-delimiter //;
---error ER_UNKNOWN_SYSTEM_VARIABLE
-CREATE PROCEDURE p1()
-BEGIN
-  DECLARE v INT DEFAULT 0;
-  SET @@session.v= 10;
-END//
-CREATE PROCEDURE p2()
-BEGIN
-  DECLARE v INT DEFAULT 0;
-  SET v= 10;
-END//
-call p2()//
---error ER_UNKNOWN_SYSTEM_VARIABLE
-CREATE PROCEDURE p3()
-BEGIN
-  DECLARE v INT DEFAULT 0;
-  SELECT @@session.v;
-END//
---error ER_UNKNOWN_SYSTEM_VARIABLE
-CREATE PROCEDURE p4()
-BEGIN
-  DECLARE v INT DEFAULT 0;
-  SET @@global.v= 10;
-END//
-CREATE PROCEDURE p5()
-BEGIN
-  DECLARE v INT DEFAULT 0;
-  SET @@global.query_cache_size= 0;
-  SET @@session.identity= 1;
-  SELECT @@session.identity;
-  SELECT @@global.query_cache_size;
-END//
-delimiter ;//
-CALL p5();
-DROP PROCEDURE p2;
-DROP PROCEDURE p5;
+
 --echo # ------------------------------------------------------------------
 --echo # -- End of 5.1 tests
 --echo # ------------------------------------------------------------------

sql/sql_yacc.yy

@@ -11783,17 +11783,8 @@ option_type:
         ;
 
 option_type2:
-          /* empty */
-          {
-            $$= OPT_DEFAULT;
-            Lex->option_type= OPT_DEFAULT;
-          }
-        | ONE_SHOT_SYM
-          {
-            Lex->one_shot_set= 1;
-            $$= OPT_SESSION;
-            Lex->option_type= OPT_SESSION;
-          }
+          /* empty */ { $$= OPT_DEFAULT; }
+        | ONE_SHOT_SYM { Lex->one_shot_set= 1; $$= OPT_SESSION; }
         ;
 
 opt_var_type:
@@ -11804,26 +11795,10 @@ opt_var_type:
         ;
 
 opt_var_ident_type:
-          /* empty */
-          {
-            $$=OPT_DEFAULT;
-            Lex->option_type= OPT_DEFAULT;
-          }
-        | GLOBAL_SYM '.'
-          {
-            $$=OPT_GLOBAL;
-            Lex->option_type= OPT_GLOBAL;
-          }
-        | LOCAL_SYM '.'
-          {
-            $$=OPT_SESSION;
-            Lex->option_type= OPT_SESSION;
-          }
-        | SESSION_SYM '.'
-          {
-            $$=OPT_SESSION;
-            Lex->option_type= OPT_SESSION;
-          }
+          /* empty */     { $$=OPT_DEFAULT; }
+        | GLOBAL_SYM '.'  { $$=OPT_GLOBAL; }
+        | LOCAL_SYM '.'   { $$=OPT_SESSION; }
+        | SESSION_SYM '.' { $$=OPT_SESSION; }
         ;
 
 ext_option_value:
@@ -12063,22 +12038,8 @@ internal_variable_name:
             sp_pcontext *spc= lex->spcont;
             sp_variable_t *spv;
 
-            /*
-              We have to lookup here since local vars can shadow sysvars.
-
-              We also have to inspect the option_type first since the variable
-              identifier might have been prefixed with @@session or @@global
-              prefixes. Without this check we would wrongly identify them
-              as SP local variables.
-            */
-            if (lex->option_type == OPT_DEFAULT && spc &&
-                (spv= spc->find_variable(&$1)))
-            {
-              /* An SP local variable */
-              $$.var= NULL;
-              $$.base_name= $1;     
-            }
-            else
+            /* We have to lookup here since local vars can shadow sysvars */
+            if (!spc || !(spv = spc->find_variable(&$1)))
             {
               /* Not an SP local variable */
               sys_var *tmp=find_sys_var(thd, $1.str, $1.length);
@@ -12095,6 +12056,12 @@ internal_variable_name:
                 lex->sphead->m_flags|= sp_head::HAS_SET_AUTOCOMMIT_STMT;
               }
             }
+            else
+            {
+              /* An SP local variable */
+              $$.var= NULL;
+              $$.base_name= $1;
+            }
           }
         | ident '.' ident
           {