Merge rolltop.ignatz42.dyndns.org:/mnt/storeage/bug20836/my41-bug20836

into  rolltop.ignatz42.dyndns.org:/mnt/storeage/bug20836/my50-bug20836


mysql-test/r/distinct.result:
  manual merge
mysql-test/t/distinct.test:
  manual merge
sql/sql_class.cc:
  manual merge
sql/sql_class.h:
  manual merge

mysql-test/r/distinct.result

@@ -607,3 +607,62 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 SELECT DISTINCT a,a FROM t1 WHERE b < 12 ORDER BY a;
 a	a
 DROP TABLE t1;
+DROP TABLE IF EXISTS t1;
+CREATE TABLE t1 (id INT NOT NULL, fruit_id INT NOT NULL, fruit_name varchar(20)
+default NULL);
+INSERT INTO t1 VALUES (1,1,'ORANGE');
+INSERT INTO t1 VALUES (2,2,'APPLE');
+INSERT INTO t1 VALUES (3,2,'APPLE');
+INSERT INTO t1 VALUES (4,3,'PEAR');
+SELECT DISTINCT fruit_id, fruit_name INTO @v1, @v2 FROM t1 WHERE fruit_name = 
+'APPLE';
+SELECT @v1, @v2;
+@v1	@v2
+2	APPLE
+SELECT DISTINCT fruit_id, fruit_name INTO @v3, @v4 FROM t1 GROUP BY fruit_id, 
+fruit_name HAVING fruit_name = 'APPLE';
+SELECT @v3, @v4;
+@v3	@v4
+2	APPLE
+SELECT DISTINCT @v5:= fruit_id, @v6:= fruit_name INTO @v7, @v8 FROM t1 WHERE 
+fruit_name = 'APPLE';
+SELECT @v5, @v6, @v7, @v8;
+@v5	@v6	@v7	@v8
+2	APPLE	2	APPLE
+SELECT DISTINCT @v5 + fruit_id, CONCAT(@v6, fruit_name) INTO @v9, @v10 FROM t1 
+WHERE fruit_name = 'APPLE';
+SELECT @v5, @v6, @v7, @v8, @v9, @v10;
+@v5	@v6	@v7	@v8	@v9	@v10
+2	APPLE	2	APPLE	4	APPLEAPPLE
+SELECT DISTINCT @v11:= @v5 + fruit_id, @v12:= CONCAT(@v6, fruit_name) INTO 
+@v13, @v14 FROM t1 WHERE fruit_name = 'APPLE';
+SELECT @v11, @v12, @v13, @v14;
+@v11	@v12	@v13	@v14
+4	APPLEAPPLE	4	APPLEAPPLE
+SELECT DISTINCT @v13, @v14 INTO @v15, @v16 FROM t1 WHERE fruit_name = 'APPLE';
+SELECT @v15, @v16;
+@v15	@v16
+4	APPLEAPPLE
+SELECT DISTINCT 2 + 2, 'Bob' INTO @v17, @v18 FROM t1 WHERE fruit_name = 
+'APPLE';
+SELECT @v17, @v18;
+@v17	@v18
+4	Bob
+DROP TABLE IF EXISTS t2;
+CREATE TABLE t2 (fruit_id INT NOT NULL, fruit_name varchar(20)
+default NULL);
+SELECT DISTINCT fruit_id, fruit_name INTO OUTFILE 
+'../tmp/data1.tmp' FROM t1 WHERE fruit_name = 'APPLE';
+LOAD DATA INFILE '../tmp/data1.tmp' INTO TABLE t2;
+SELECT DISTINCT @v19:= fruit_id, @v20:= fruit_name INTO OUTFILE 
+'../tmp/data2.tmp' FROM t1 WHERE fruit_name = 'APPLE';
+LOAD DATA INFILE '../tmp/data2.tmp' INTO TABLE t2;
+SELECT @v19, @v20;
+@v19	@v20
+2	APPLE
+SELECT * FROM t2;
+fruit_id	fruit_name
+2	APPLE
+2	APPLE
+DROP TABLE t1;
+DROP TABLE t2;

mysql-test/t/distinct.test

@@ -437,3 +437,68 @@ EXPLAIN SELECT DISTINCT a,a FROM t1 WHERE b < 12 ORDER BY a;
 SELECT DISTINCT a,a FROM t1 WHERE b < 12 ORDER BY a;
 
 DROP TABLE t1;
+#
+#Bug #20836: Selecting into variables results in wrong results being returned
+#
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+--enable_warnings
+
+CREATE TABLE t1 (id INT NOT NULL, fruit_id INT NOT NULL, fruit_name varchar(20)
+default NULL);
+
+INSERT INTO t1 VALUES (1,1,'ORANGE');
+INSERT INTO t1 VALUES (2,2,'APPLE');
+INSERT INTO t1 VALUES (3,2,'APPLE');
+INSERT INTO t1 VALUES (4,3,'PEAR');
+
+SELECT DISTINCT fruit_id, fruit_name INTO @v1, @v2 FROM t1 WHERE fruit_name = 
+'APPLE';
+SELECT @v1, @v2;
+
+SELECT DISTINCT fruit_id, fruit_name INTO @v3, @v4 FROM t1 GROUP BY fruit_id, 
+fruit_name HAVING fruit_name = 'APPLE';
+SELECT @v3, @v4;
+
+SELECT DISTINCT @v5:= fruit_id, @v6:= fruit_name INTO @v7, @v8 FROM t1 WHERE 
+fruit_name = 'APPLE';
+SELECT @v5, @v6, @v7, @v8;
+
+SELECT DISTINCT @v5 + fruit_id, CONCAT(@v6, fruit_name) INTO @v9, @v10 FROM t1 
+WHERE fruit_name = 'APPLE';
+SELECT @v5, @v6, @v7, @v8, @v9, @v10;
+
+SELECT DISTINCT @v11:= @v5 + fruit_id, @v12:= CONCAT(@v6, fruit_name) INTO 
+@v13, @v14 FROM t1 WHERE fruit_name = 'APPLE';
+SELECT @v11, @v12, @v13, @v14;
+
+SELECT DISTINCT @v13, @v14 INTO @v15, @v16 FROM t1 WHERE fruit_name = 'APPLE';
+SELECT @v15, @v16;
+
+SELECT DISTINCT 2 + 2, 'Bob' INTO @v17, @v18 FROM t1 WHERE fruit_name = 
+'APPLE';
+SELECT @v17, @v18;
+
+--disable_warnings
+DROP TABLE IF EXISTS t2;
+--enable_warnings
+
+CREATE TABLE t2 (fruit_id INT NOT NULL, fruit_name varchar(20)
+default NULL);
+
+SELECT DISTINCT fruit_id, fruit_name INTO OUTFILE 
+'../tmp/data1.tmp' FROM t1 WHERE fruit_name = 'APPLE';
+LOAD DATA INFILE '../tmp/data1.tmp' INTO TABLE t2;
+--exec rm $MYSQL_TEST_DIR/var/tmp/data1.tmp
+
+SELECT DISTINCT @v19:= fruit_id, @v20:= fruit_name INTO OUTFILE 
+'../tmp/data2.tmp' FROM t1 WHERE fruit_name = 'APPLE';
+LOAD DATA INFILE '../tmp/data2.tmp' INTO TABLE t2;
+--exec rm $MYSQL_TEST_DIR/var/tmp/data2.tmp
+
+SELECT @v19, @v20;
+SELECT * FROM t2;
+
+DROP TABLE t1;
+DROP TABLE t2;
+

sql/sql_class.cc

@@ -1510,53 +1510,21 @@ bool select_exists_subselect::send_data(List<Item> &items)
 
 int select_dumpvar::prepare(List<Item> &list, SELECT_LEX_UNIT *u)
 {
-  List_iterator_fast<Item> li(list);
-  List_iterator_fast<my_var> gl(var_list);
-  Item *item;
-
-  local_vars.empty();				// Clear list if SP
   unit= u;
-  row_count= 0;
+  
-
   if (var_list.elements != list.elements)
   {
     my_message(ER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT,
                ER(ER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT), MYF(0));
     return 1;
-  }
+  }               
-  while ((item=li++))
-  {
-    my_var *mv= gl++;
-    if (mv->local)
-    {
-      Item_splocal *var= new Item_splocal(mv->s, mv->offset, mv->type);
-      (void)local_vars.push_back(var);
-#ifndef DBUG_OFF
-      var->m_sp= mv->sp;
-#endif
-    }
-    else
-    {
-      Item_func_set_user_var *var= new Item_func_set_user_var(mv->s, item);
-      /*
-        Item_func_set_user_var can't substitute something else on its place =>
-        0 can be passed as last argument (reference on item)
-        Item_func_set_user_var can't be fixed after creation, so we do not
-        check var->fixed
-      */
-      var->fix_fields(thd, 0);
-      var->fix_length_and_dec();
-      vars.push_back(var);
-    }
-  }
   return 0;
 }
 
 
 void select_dumpvar::cleanup()
 {
-  vars.empty();
+  row_count= 0;
-  row_count=0;
 }
 
 
@@ -1865,13 +1833,10 @@ Statement_map::~Statement_map()
 
 bool select_dumpvar::send_data(List<Item> &items)
 {
-  List_iterator_fast<Item_func_set_user_var> li(vars);
+  List_iterator_fast<my_var> var_li(var_list);
-  List_iterator_fast<Item_splocal> var_li(local_vars);
-  List_iterator_fast<my_var> my_li(var_list);
   List_iterator<Item> it(items);
-  Item_func_set_user_var *xx;
+  Item *item;
-  Item_splocal *yy;
+  my_var *mv;
-  my_var *zz;
   DBUG_ENTER("select_dumpvar::send_data");
 
   if (unit->offset_limit_cnt)
@@ -1884,24 +1849,29 @@ bool select_dumpvar::send_data(List<Item> &items)
     my_message(ER_TOO_MANY_ROWS, ER(ER_TOO_MANY_ROWS), MYF(0));
     DBUG_RETURN(1);
   }
-  while ((zz=my_li++) && (it++))
+  while ((mv= var_li++) && (item= it++))
   {
-    if (zz->local)
+    if (mv->local)
     {
-      if ((yy=var_li++)) 
+      if (thd->spcont->set_variable(current_thd, yy->get_var_idx(),
-      {
-	if (thd->spcont->set_variable(current_thd, yy->get_var_idx(),
                                       it.ref()))
 	  DBUG_RETURN(1);
-      }
     }
     else
     {
-      if ((xx=li++))
+      Item_func_set_user_var *suv= new Item_func_set_user_var(*ls, item);
-      {
+
-        xx->check(0);
+      /*
-	xx->update();
+        Item_func_set_user_var can't substitute something else on its
-      }
+        place => NULL may be passed as last argument (reference on
+        item) Item_func_set_user_var can't be fixed after creation, so
+        we do not check var->fixed
+      */
+
+      suv->fix_fields(thd, (TABLE_LIST *) thd->lex->select_lex.table_list.first,
+            0);
+      suv->check();
+      suv->update();
     }
   }
   DBUG_RETURN(0);

sql/sql_class.h

@@ -2189,9 +2189,7 @@ class select_dumpvar :public select_result_interceptor {
   ha_rows row_count;
 public:
   List<my_var> var_list;
-  List<Item_func_set_user_var> vars;
+  select_dumpvar()  { var_list.empty(); row_count= 0;}
-  List<Item_splocal> local_vars;
-  select_dumpvar(void)  { var_list.empty(); local_vars.empty(); vars.empty(); row_count=0;}
   ~select_dumpvar() {}
   int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
   bool send_data(List<Item> &items);