Fixed BUG#3157: Crash if stored procedure contains IF EXISTS,

and BUG#336: Subselects with tables does not work as values for
local SP variables (which was closed before with a temp. fix, but not
actually fixed).


mysql-test/r/sp-error.result:
  Moved test case for BUG#336 to sp.test, as it's not generating an error any longer.
mysql-test/r/sp.result:
  Move test case for BUG#336 from sp-error.test and added new test case
  for BUG#3157.
mysql-test/t/sp-error.test:
  Moved test case for BUG#336 to sp.test, as it's not generating an error any longer.
mysql-test/t/sp.test:
  Move test case for BUG#336 from sp-error.test and added new test case
  for BUG#3157.
sql/sp_head.cc:
  Open and close tables in set, jump-if[-not] and freturn instructions if
  the value expression is a subselect.
sql/sp_head.h:
  Store tables in set, jump-if[-not] and freturn instructions if
  the value expression is a subselect.
sql/sql_yacc.yy:
  Store tables in set, jump-if[-not] and freturn instructions if
  the value expression is a subselect.

mysql-test/r/sp-error.result

@@ -299,12 +299,6 @@ ERROR 42S22: Unknown column 'valname' in 'order clause'
 drop procedure bug1965|
 select 1 into a|
 ERROR 42000: Undeclared variable: a
-create procedure bug336(id char(16))
-begin
-declare x int;
-set x = (select sum(t.data) from test.t2 t);
-end|
-ERROR 0A000: Subselect value not supported
 create function bug1654()
 returns int
 return (select sum(t.data) from test.t2 t)|

mysql-test/r/sp.result

@@ -1674,6 +1674,36 @@ create table t2 as select * from t;
 end|
 call bug4904()|
 drop procedure bug4904|
+create procedure bug336(out y int)
+begin
+declare x int;
+set x = (select sum(t.data) from test.t1 t);
+set y = x;
+end|
+insert into t1 values ("a", 2), ("b", 3)|
+call bug336(@y)|
+select @y|
+@y
+5
+delete from t1|
+drop procedure bug336|
+create procedure bug3157()
+begin
+if exists(select * from t1) then
+set @n= @n + 1;
+end if;
+if (select count(*) from t1) then
+set @n= @n + 1;
+end if;
+end|
+set @n = 0|
+insert into t1 values ("a", 1)|
+call bug3157()|
+select @n|
+@n
+2
+delete from t1|
+drop procedure bug3157|
 drop table if exists fac|
 create table fac (n int unsigned not null primary key, f bigint unsigned)|
 create procedure ifac(n int unsigned)

mysql-test/t/sp-error.test

@@ -400,16 +400,6 @@ drop procedure bug1965|
 --error 1326
 select 1 into a|
 
-#
-# BUG#336
-#
---error 1334
-create procedure bug336(id char(16))
-begin
-  declare x int;
-  set x = (select sum(t.data) from test.t2 t);
-end|
-
 #
 # BUG#1654
 #

mysql-test/t/sp.test

@@ -1808,6 +1808,42 @@ call bug4904()|
 
 drop procedure bug4904|
 
+#
+# BUG#336
+#
+create procedure bug336(out y int)
+begin
+  declare x int;
+  set x = (select sum(t.data) from test.t1 t);
+  set y = x;
+end|
+
+insert into t1 values ("a", 2), ("b", 3)|
+call bug336(@y)|
+select @y|
+delete from t1|
+drop procedure bug336|
+
+#
+# BUG#3157
+#
+create procedure bug3157()
+begin
+  if exists(select * from t1) then
+    set @n= @n + 1;
+  end if;
+  if (select count(*) from t1) then
+    set @n= @n + 1;
+  end if;
+end|
+
+set @n = 0|
+insert into t1 values ("a", 1)|
+call bug3157()|
+select @n|
+delete from t1|
+drop procedure bug3157|
+
 
 #
 # Some "real" examples

sql/sp_head.cc

@@ -1180,13 +1180,26 @@ sp_instr_set::execute(THD *thd, uint *nextp)
 {
   DBUG_ENTER("sp_instr_set::execute");
   DBUG_PRINT("info", ("offset: %u", m_offset));
-  Item *it= sp_eval_func_item(thd, m_value, m_type);
+  Item *it;
+  int res;
 
-  if (! it)
+  if (tables &&
+      ((res= check_table_access(thd, SELECT_ACL, tables, 0)) ||
+       (res= open_and_lock_tables(thd, tables))))
     DBUG_RETURN(-1);
+
+  it= sp_eval_func_item(thd, m_value, m_type);
+  if (! it)
+    res= -1;
+  else
+  {
+    res= 0;
     thd->spcont->set_item(m_offset, it);
+  }
   *nextp = m_ip+1;
-  DBUG_RETURN(0);
+  if (thd->lock || thd->open_tables || thd->derived_tables)
+    close_thread_tables(thd);
+  DBUG_RETURN(res);
 }
 
 void
@@ -1265,15 +1278,28 @@ sp_instr_jump_if::execute(THD *thd, uint *nextp)
 {
   DBUG_ENTER("sp_instr_jump_if::execute");
   DBUG_PRINT("info", ("destination: %u", m_dest));
-  Item *it= sp_eval_func_item(thd, m_expr, MYSQL_TYPE_TINY);
+  Item *it;
+  int res;
 
-  if (!it)
+  if (tables &&
+      ((res= check_table_access(thd, SELECT_ACL, tables, 0)) ||
+       (res= open_and_lock_tables(thd, tables))))
     DBUG_RETURN(-1);
+
+  it= sp_eval_func_item(thd, m_expr, MYSQL_TYPE_TINY);
+  if (!it)
+    res= -1;
+  else
+  {
+    res= 0;
     if (it->val_int())
       *nextp = m_dest;
     else
       *nextp = m_ip+1;
-  DBUG_RETURN(0);
+  }
+  if (thd->lock || thd->open_tables || thd->derived_tables)
+    close_thread_tables(thd);
+  DBUG_RETURN(res);
 }
 
 void
@@ -1309,15 +1335,28 @@ sp_instr_jump_if_not::execute(THD *thd, uint *nextp)
 {
   DBUG_ENTER("sp_instr_jump_if_not::execute");
   DBUG_PRINT("info", ("destination: %u", m_dest));
-  Item *it= sp_eval_func_item(thd, m_expr, MYSQL_TYPE_TINY);
+  Item *it;
+  int res;
 
-  if (! it)
+  if (tables &&
+      ((res= check_table_access(thd, SELECT_ACL, tables, 0)) ||
+       (res= open_and_lock_tables(thd, tables))))
     DBUG_RETURN(-1);
+
+  it= sp_eval_func_item(thd, m_expr, MYSQL_TYPE_TINY);
+  if (! it)
+    res= -1;
+  else
+  {
+    res= 0;
     if (! it->val_int())
       *nextp = m_dest;
     else
       *nextp = m_ip+1;
-  DBUG_RETURN(0);
+  }
+  if (thd->lock || thd->open_tables || thd->derived_tables)
+    close_thread_tables(thd);
+  DBUG_RETURN(res);
 }
 
 void
@@ -1352,13 +1391,24 @@ int
 sp_instr_freturn::execute(THD *thd, uint *nextp)
 {
   DBUG_ENTER("sp_instr_freturn::execute");
-  Item *it= sp_eval_func_item(thd, m_value, m_type);
+  Item *it;
+  int res;
 
-  if (! it)
+  if (tables &&
+      ((res= check_table_access(thd, SELECT_ACL, tables, 0)) ||
+       (res= open_and_lock_tables(thd, tables))))
     DBUG_RETURN(-1);
+
+  it= sp_eval_func_item(thd, m_value, m_type);
+  if (! it)
+    res= -1;
+  else
+  {
+    res= 0;
     thd->spcont->set_result(it);
+  }
   *nextp= UINT_MAX;
-  DBUG_RETURN(0);
+  DBUG_RETURN(res);
 }
 
 void

sql/sp_head.h

@@ -351,8 +351,10 @@ class sp_instr_set : public sp_instr
 
 public:
 
+  TABLE_LIST *tables;
+
   sp_instr_set(uint ip, uint offset, Item *val, enum enum_field_types type)
-    : sp_instr(ip), m_offset(offset), m_value(val), m_type(type)
+    : sp_instr(ip), tables(NULL), m_offset(offset), m_value(val), m_type(type)
   {}
 
   virtual ~sp_instr_set()
@@ -421,12 +423,14 @@ class sp_instr_jump_if : public sp_instr_jump
 
 public:
 
+  TABLE_LIST *tables;
+
   sp_instr_jump_if(uint ip, Item *i)
-    : sp_instr_jump(ip), m_expr(i)
+    : sp_instr_jump(ip), tables(NULL), m_expr(i)
   {}
 
   sp_instr_jump_if(uint ip, Item *i, uint dest)
-    : sp_instr_jump(ip, dest), m_expr(i)
+    : sp_instr_jump(ip, dest), tables(NULL), m_expr(i)
   {}
 
   virtual ~sp_instr_jump_if()
@@ -457,12 +461,14 @@ class sp_instr_jump_if_not : public sp_instr_jump
 
 public:
 
+  TABLE_LIST *tables;
+
   sp_instr_jump_if_not(uint ip, Item *i)
-    : sp_instr_jump(ip), m_expr(i)
+    : sp_instr_jump(ip), tables(NULL), m_expr(i)
   {}
 
   sp_instr_jump_if_not(uint ip, Item *i, uint dest)
-    : sp_instr_jump(ip, dest), m_expr(i)
+    : sp_instr_jump(ip, dest), tables(NULL), m_expr(i)
   {}
 
   virtual ~sp_instr_jump_if_not()
@@ -493,8 +499,10 @@ class sp_instr_freturn : public sp_instr
 
 public:
 
+  TABLE_LIST *tables;
+
   sp_instr_freturn(uint ip, Item *val, enum enum_field_types type)
-    : sp_instr(ip), m_value(val), m_type(type)
+    : sp_instr(ip), tables(NULL), m_value(val), m_type(type)
   {}
 
   virtual ~sp_instr_freturn()

sql/sql_yacc.yy

@@ -1434,7 +1434,8 @@ sp_opt_inout:
 
 sp_proc_stmts:
 	  /* Empty */ {}
-	| sp_proc_stmts sp_proc_stmt ';'
+	| sp_proc_stmts  { Lex->query_tables= 0; } sp_proc_stmt ';'
+
 	;
 
 sp_decls:
@@ -1483,6 +1484,8 @@ sp_decl:
 	        sp_instr_set *in= new sp_instr_set(lex->sphead->instructions(),
 	                                           i, it, type);
 
+		in->tables= lex->query_tables;
+		lex->query_tables= 0;
 	        lex->sphead->add_instr(in);
 	        lex->spcont->set_isset(i, TRUE);
 		lex->spcont->set_default(i, it);
@@ -1799,6 +1802,8 @@ sp_proc_stmt:
 	    dummy.str= (char *)"";
 	    dummy.length= 0;
 	    lex->spcont->push_pvar(&dummy, MYSQL_TYPE_STRING, sp_param_in);
+	    i->tables= lex->query_tables;
+	    lex->query_tables= 0;
 	    lex->sphead->add_instr(i);
 	    lex->sphead->m_simple_case= TRUE;
 	  }
@@ -2047,11 +2052,14 @@ sp_fetch_list:
 sp_if:
 	  expr THEN_SYM
 	  {
-	    sp_head *sp= Lex->sphead;
-	    sp_pcontext *ctx= Lex->spcont;
+	    LEX *lex= Lex;
+	    sp_head *sp= lex->sphead;
+	    sp_pcontext *ctx= lex->spcont;
 	    uint ip= sp->instructions();
 	    sp_instr_jump_if_not *i = new sp_instr_jump_if_not(ip, $1);
 
+	    i->tables= lex->query_tables;
+	    lex->query_tables= 0;
 	    sp->push_backpatch(i, ctx->push_label((char *)"", 0));
             sp->add_instr(i);
 	  }
@@ -2105,6 +2113,8 @@ sp_case:
               lex->variables_used= 1;
 	    }
 	    sp->push_backpatch(i, ctx->push_label((char *)"", 0));
+	    i->tables= lex->query_tables;
+	    lex->query_tables= 0;
             sp->add_instr(i);
 	  }
 	  sp_proc_stmts
@@ -2240,6 +2250,8 @@ sp_unlabeled_control:
 
 	    /* Jumping forward */
 	    sp->push_backpatch(i, lex->spcont->last_label());
+	    i->tables= lex->query_tables;
+	    lex->query_tables= 0;
             sp->add_instr(i);
 	  }
 	  sp_proc_stmts END WHILE_SYM
@@ -2258,6 +2270,8 @@ sp_unlabeled_control:
 	    sp_label_t *lab= lex->spcont->last_label();  /* Jumping back */
 	    sp_instr_jump_if_not *i = new sp_instr_jump_if_not(ip, $4, lab->ip);
 
+	    i->tables= lex->query_tables;
+	    lex->query_tables= 0;
             lex->sphead->add_instr(i);
 	  }
 	;
@@ -6776,11 +6790,6 @@ option_value:
               sp_instr_set *i;
 	      Item *it;
 
-	      if ($3 && $3->type() == Item::SUBSELECT_ITEM)
-	      {  /* QQ For now, just disallow subselects as values */
-	        send_error(lex->thd, ER_SP_SUBSELECT_NYI);
-	        YYABORT;
-	      }
 	      spv= lex->spcont->find_pvar(&$1.base_name);
 
 	      if ($3)
@@ -6791,6 +6800,8 @@ option_value:
 	        it= new Item_null();
               i= new sp_instr_set(lex->sphead->instructions(),
 	                          spv->offset, it, spv->type);
+	      i->tables= lex->query_tables;
+	      lex->query_tables= 0;
 	      lex->sphead->add_instr(i);
 	      spv->isset= TRUE;
 	    }