Merge rurik.mysql.com:/home/igor/dev/mysql-4.1-0

into  rurik.mysql.com:/home/igor/dev/mysql-5.0-0


mysql-test/r/having.result:
  Auto merged
mysql-test/t/having.test:
  Auto merged
sql/item_func.cc:
  Auto merged
sql/sql_lex.h:
  Auto merged
mysql-test/r/rpl_user_variables.result:
  Manual merge
mysql-test/t/rpl_user_variables.test:
  Manual merge
sql/sql_lex.cc:
  Manual merge
sql/sql_prepare.cc:
  Manual merge
sql/sql_select.cc:
  Manual merge

mysql-test/r/rpl_user_variables.result

@@ -76,35 +76,35 @@ abcn1n2
 NULL
 NULL
 NULL
-show binlog events from 98;
-Log_name	Pos	Event_type	Server_id	End_log_pos	Info
-slave-bin.000001	#	Query	1	#	use `test`; create table t1(n char(30))
-slave-bin.000001	#	User var	2	#	@`i1`=12345678901234
-slave-bin.000001	#	User var	2	#	@`i2`=-12345678901234
-slave-bin.000001	#	User var	2	#	@`i3`=0
-slave-bin.000001	#	User var	2	#	@`i4`=-1
-slave-bin.000001	#	Query	1	#	use `test`; insert into t1 values (@i1), (@i2), (@i3), (@i4)
-slave-bin.000001	#	User var	2	#	@`r1`=12.5
-slave-bin.000001	#	User var	2	#	@`r2`=-12.5
-slave-bin.000001	#	Query	1	#	use `test`; insert into t1 values (@r1), (@r2)
-slave-bin.000001	#	User var	2	#	@`s1`=_latin1 0x5468697320697320612074657374 COLLATE latin1_swedish_ci
-slave-bin.000001	#	User var	2	#	@`s2`=_latin1 "" COLLATE latin1_swedish_ci
-slave-bin.000001	#	User var	2	#	@`s3`=_latin1 0x61626327646566 COLLATE latin1_swedish_ci
-slave-bin.000001	#	User var	2	#	@`s4`=_latin1 0x6162635C646566 COLLATE latin1_swedish_ci
-slave-bin.000001	#	User var	2	#	@`s5`=_latin1 0x61626327646566 COLLATE latin1_swedish_ci
-slave-bin.000001	#	Query	1	#	use `test`; insert into t1 values (@s1), (@s2), (@s3), (@s4), (@s5)
-slave-bin.000001	#	User var	2	#	@`n1`=NULL
-slave-bin.000001	#	Query	1	#	use `test`; insert into t1 values (@n1)
-slave-bin.000001	#	User var	2	#	@`n2`=NULL
-slave-bin.000001	#	Query	1	#	use `test`; insert into t1 values (@n2)
-slave-bin.000001	#	Query	1	#	use `test`; insert into t1 values (@a:=0), (@a:=@a+1), (@a:=@a+1)
-slave-bin.000001	#	User var	2	#	@`a`=2
-slave-bin.000001	#	Query	1	#	use `test`; insert into t1 values (@a+(@b:=@a+1))
-slave-bin.000001	#	User var	2	#	@`q`=_latin1 0x616263 COLLATE latin1_swedish_ci
-slave-bin.000001	#	Query	1	#	use `test`; insert t1 values (@q), (@q:=concat(@q, 'n1')), (@q:=concat(@q, 'n2'))
-slave-bin.000001	#	User var	2	#	@`a`=5
-slave-bin.000001	#	Query	1	#	use `test`; insert into t1 values (@a),(@a)
-slave-bin.000001	#	User var	2	#	@`a`=NULL
-slave-bin.000001	#	Query	1	#	use `test`; insert into t1 values (@a),(@a),(@a*5)
+show binlog events from 141;
+Log_name	Pos	Event_type	Server_id	Orig_log_pos	Info
+slave-bin.000001	141	User var	2	141	@`i1`=12345678901234
+slave-bin.000001	184	User var	2	184	@`i2`=-12345678901234
+slave-bin.000001	227	User var	2	227	@`i3`=0
+slave-bin.000001	270	User var	2	270	@`i4`=-1
+slave-bin.000001	313	Query	1	313	use `test`; insert into t1 values (@i1), (@i2), (@i3), (@i4)
+slave-bin.000001	396	User var	2	396	@`r1`=12.5
+slave-bin.000001	439	User var	2	439	@`r2`=-12.5
+slave-bin.000001	482	Query	1	482	use `test`; insert into t1 values (@r1), (@r2)
+slave-bin.000001	551	User var	2	551	@`s1`=_latin1 0x5468697320697320612074657374 COLLATE latin1_swedish_ci
+slave-bin.000001	600	User var	2	600	@`s2`=_latin1 "" COLLATE latin1_swedish_ci
+slave-bin.000001	635	User var	2	635	@`s3`=_latin1 0x61626327646566 COLLATE latin1_swedish_ci
+slave-bin.000001	677	User var	2	677	@`s4`=_latin1 0x6162635C646566 COLLATE latin1_swedish_ci
+slave-bin.000001	719	User var	2	719	@`s5`=_latin1 0x61626327646566 COLLATE latin1_swedish_ci
+slave-bin.000001	761	Query	1	761	use `test`; insert into t1 values (@s1), (@s2), (@s3), (@s4), (@s5)
+slave-bin.000001	851	User var	2	851	@`n1`=NULL
+slave-bin.000001	877	Query	1	877	use `test`; insert into t1 values (@n1)
+slave-bin.000001	939	User var	2	939	@`n2`=NULL
+slave-bin.000001	965	Query	1	965	use `test`; insert into t1 values (@n2)
+slave-bin.000001	1027	Query	1	1027	use `test`; insert into t1 values (@a:=0), (@a:=@a+1), (@a:=@a+1)
+slave-bin.000001	1115	User var	2	1115	@`a`=2
+slave-bin.000001	1157	Query	1	1157	use `test`; insert into t1 values (@a+(@b:=@a+1))
+slave-bin.000001	1229	User var	2	1229	@`q`=_latin1 0x616263 COLLATE latin1_swedish_ci
+slave-bin.000001	1266	Query	1	1266	use `test`; insert t1 values (@q), (@q:=concat(@q, 'n1')), (@q:=concat(@q, 'n2'))
+slave-bin.000001	1370	User var	2	1370	@`a`=5
+slave-bin.000001	1412	Query	1	1412	use `test`; insert into t1 values (@a),(@a)
+slave-bin.000001	1478	User var	2	1478	@`a`=NULL
+slave-bin.000001	1503	Query	1	1503	use `test`; insert into t1 values (@a),(@a),(@a*5)
+insert into t1 select * FROM (select @var1 union  select @var2) AS t2;
 drop table t1;
 stop slave;

mysql-test/t/rpl_user_variables.test

@@ -48,9 +48,15 @@ sync_with_master;
 select * from t1;
 --replace_column 2 # 5 #
 show binlog events from 98;
+
+#
+# BUG19136: Crashing log-bin and uninitialized user variables in a derived table
+# just to check nothing bad happens anymore
 connection master;
+insert into t1 select * FROM (select @var1 union  select @var2) AS t2;
 drop table t1;
 save_master_pos;
+
 connection slave;
 sync_with_master;
 stop slave;

sql/item_func.cc

@@ -3946,14 +3946,24 @@ int get_var_with_binlog(THD *thd, enum_sql_command sql_command,
       sql_set_variables(), we could instead manually call check() and update();
       this would save memory and time; but calling sql_set_variables() makes
       one unique place to maintain (sql_set_variables()). 
+
+      Manipulation with lex is necessary since free_underlaid_joins
+      is going to release memory belonging to the main query.
     */
 
     List<set_var_base> tmp_var_list;
+    LEX *sav_lex= thd->lex, lex_tmp;
+    thd->lex= &lex_tmp;
+    lex_start(thd, NULL, 0);
     tmp_var_list.push_back(new set_var_user(new Item_func_set_user_var(name,
                                                                        new Item_null())));
     /* Create the variable */
     if (sql_set_variables(thd, &tmp_var_list))
+    {
+      thd->lex= sav_lex;
       goto err;
+    }
+    thd->lex= sav_lex;
     if (!(var_entry= get_variable(&thd->user_vars, name, 0)))
       goto err;
   }

sql/sql_lex.cc

@@ -1145,7 +1145,7 @@ void st_select_lex::init_query()
   cond_count= with_wild= 0;
   conds_processed_with_permanent_arena= 0;
   ref_pointer_array= 0;
-  select_n_having_items= 0;
+  select_n_having_items= 0;}
   subquery_in_having= explicit_limit= 0;
   is_item_list_lookup= 0;
   first_execution= 1;

sql/sql_prepare.cc

@@ -1965,7 +1965,6 @@ static const char *get_dynamic_sql_string(LEX *lex, uint *query_len)
       memcpy(query_str, var_value->ptr(), var_value->length());
     query_str[len]= '\0';                       // Safety (mostly for debug)
     *query_len= len;
-  }
   else
   {
     query_str= lex->prepared_stmt_code.str;
@@ -2105,7 +2104,6 @@ void reinit_stmt_before_use(THD *thd, LEX *lex)
       /* Fix ORDER list */
       for (order= (ORDER *)sl->order_list.first; order; order= order->next)
         order->item= &order->item_ptr;
-    }
     {
       SELECT_LEX_UNIT *unit= sl->master_unit();
       unit->unclean();