Merge from 5.0-bugteam

client/mysqlbinlog.cc

@@ -626,6 +626,7 @@ Create_file event for file_id: %u\n",exv->file_id);
       glob_description_event= (Format_description_log_event*) ev;
       print_event_info->common_header_len= glob_description_event->common_header_len;
       ev->print(result_file, print_event_info);
+      ev->temp_buf= 0;
       /*
         We don't want this event to be deleted now, so let's hide it (I
         (Guilhem) should later see if this triggers a non-serious Valgrind
@@ -668,8 +669,16 @@ Begin_load_query event for file_id: %u\n", exlq->file_id);
 
 end:
   rec_count++;
+  /*
+    Destroy the log_event object. If reading from a remote host,
+    set the temp_buf to NULL so that memory isn't freed twice.
+  */
   if (ev)
+  {
+    if (remote_opt)
+      ev->temp_buf= 0;
     delete ev;
+  }
   DBUG_RETURN(0);
 }
 
@@ -1151,6 +1160,11 @@ could be out of memory");
       error= 1;
       goto err;
     }   
+    /*
+      If reading from a remote host, ensure the temp_buf for the
+      Log_event class is pointing to the incoming stream.
+    */
+    ev->register_temp_buf((char *) net->read_pos + 1);
 
     Log_event_type type= ev->get_type_code();
     if (glob_description_event->binlog_version >= 3 ||

mysql-test/r/distinct.result

@@ -629,21 +629,21 @@ 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
-3	PEAR	3	PEAR
+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
-3	PEAR	3	PEAR	5	PEARAPPLE
+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
-6	PEARPEAR	6	PEARPEAR
+4	APPLEAPPLE	4	APPLEAPPLE
 SELECT DISTINCT @v13, @v14 INTO @v15, @v16 FROM t1 WHERE fruit_name = 'APPLE';
 SELECT @v15, @v16;
 @v15	@v16
-6	PEARPEAR
+4	APPLEAPPLE
 SELECT DISTINCT 2 + 2, 'Bob' INTO @v17, @v18 FROM t1 WHERE fruit_name = 
 'APPLE';
 SELECT @v17, @v18;

mysql-test/r/mysqlbinlog.result

@@ -380,4 +380,6 @@ IS NOT NULL
 1
 *** Unsigned server_id 4294967295 is found: 1 ***
 SET @@global.server_id= 1;
+RESET MASTER;
+FLUSH LOGS;
 End of 5.0 tests

mysql-test/r/user_var.result

@@ -353,3 +353,14 @@ select @a:=f4, count(f4) from t1 group by 1 desc;
 2.6	1
 1.6	4
 drop table t1;
+CREATE TABLE t1(a INT, b INT);
+INSERT INTO t1 VALUES (0, 0), (2, 1), (2, 3), (1, 1), (30, 20);
+SELECT a, b INTO @a, @b FROM t1 WHERE a=2 AND b=3 GROUP BY a, b;
+SELECT @a, @b;
+@a	@b
+2	3
+SELECT a, b FROM t1 WHERE a=2 AND b=3 GROUP BY a, b;
+a	b
+2	3
+DROP TABLE t1;
+End of 5.0 tests

mysql-test/t/mysqlbinlog.test

@@ -294,4 +294,14 @@ echo *** Unsigned server_id $s_id_max is found: $s_id_unsigned ***;
 eval SET @@global.server_id= $save_server_id;
 --remove_file $binlog_file
 
+#
+# Bug #41943: mysqlbinlog.exe crashes if --hexdump option is used
+#
+
+RESET MASTER;
+FLUSH LOGS;
+
+# We do not need the results, just make sure that mysqlbinlog does not crash
+--exec $MYSQL_BINLOG --hexdump --read-from-remote-server --user=root --host=127.0.0.1 --port=$MASTER_MYPORT  master-bin.000001 >/dev/null
+
 --echo End of 5.0 tests

mysql-test/t/user_var.test

@@ -237,3 +237,15 @@ select @a:=f2, count(f2) from t1 group by 1 desc;
 select @a:=f3, count(f3) from t1 group by 1 desc;
 select @a:=f4, count(f4) from t1 group by 1 desc;
 drop table t1;
+
+#
+# Bug#42009: SELECT into variable gives different results to direct SELECT
+#
+CREATE TABLE t1(a INT, b INT);
+INSERT INTO t1 VALUES (0, 0), (2, 1), (2, 3), (1, 1), (30, 20);
+SELECT a, b INTO @a, @b FROM t1 WHERE a=2 AND b=3 GROUP BY a, b;
+SELECT @a, @b;
+SELECT a, b FROM t1 WHERE a=2 AND b=3 GROUP BY a, b;
+DROP TABLE t1;
+
+--echo End of 5.0 tests

sql/item_func.cc

@@ -4151,6 +4151,41 @@ Item_func_set_user_var::check(bool use_result_field)
 }
 
 
+/**
+  @brief Evaluate and store item's result.
+  This function is invoked on "SELECT ... INTO @var ...".
+  
+  @param    item    An item to get value from.
+*/
+
+void Item_func_set_user_var::save_item_result(Item *item)
+{
+  DBUG_ENTER("Item_func_set_user_var::save_item_result");
+
+  switch (cached_result_type) {
+  case REAL_RESULT:
+    save_result.vreal= item->val_result();
+    break;
+  case INT_RESULT:
+    save_result.vint= item->val_int_result();
+    unsigned_flag= item->unsigned_flag;
+    break;
+  case STRING_RESULT:
+    save_result.vstr= item->str_result(&value);
+    break;
+  case DECIMAL_RESULT:
+    save_result.vdec= item->val_decimal_result(&decimal_buff);
+    break;
+  case ROW_RESULT:
+  default:
+    // Should never happen
+    DBUG_ASSERT(0);
+    break;
+  }
+  DBUG_VOID_RETURN;
+}
+
+
 /*
   This functions is invoked on SET @variable or @variable:= expression.
 

sql/item_func.h

@@ -1308,6 +1308,7 @@ class Item_func_set_user_var :public Item_func
   bool send(Protocol *protocol, String *str_arg);
   void make_field(Send_field *tmp_field);
   bool check(bool use_result_field);
+  void save_item_result(Item *item);
   bool update();
   enum Item_result result_type () const { return cached_result_type; }
   bool fix_fields(THD *thd, Item **ref);

sql/sql_class.cc

@@ -2052,7 +2052,7 @@ bool select_dumpvar::send_data(List<Item> &items)
     {
       Item_func_set_user_var *suv= new Item_func_set_user_var(mv->s, item);
       suv->fix_fields(thd, 0);
-      suv->check(0);
+      suv->save_item_result(item);
       suv->update();
     }
   }