Many files:

  Fixed a bug causing a crash for multi-update/multi-delete
  with impossible where (bug #1860).

BitKeeper/etc/logging_ok

@@ -34,6 +34,7 @@ hf@deer.(none)
 hf@deer.mysql.r18.ru
 hf@genie.(none)
 igor@hundin.mysql.fi
+igor@rurik.mysql.com
 jani@dsl-jkl1657.dial.inet.fi
 jani@hynda.(none)
 jani@hynda.mysql.fi

mysql-test/r/multi_update.result

@@ -327,3 +327,26 @@ select t1.a, t1.b,t2.a, t2.b from t1 left join t2  on t1.a=t2.a where t1.b=1 and
 a	b	a	b
 2	2	NULL	NULL
 drop table t1,t2;
+drop table if exists t1, t2;
+create table t1(id1 smallint(5), field char(5));
+create table t2(id2 smallint(5), field char(5));
+insert into t1 values (1, 'a'), (2, 'aa');
+insert into t2 values (1, 'b'), (2, 'bb');
+select * from t1;
+id1	field
+1	a
+2	aa
+select * from t2;
+id2	field
+1	b
+2	bb
+update t2 inner join t1 on t1.id1=t2.id2
+set t2.field=t1.field
+where 0=1;
+update t2, t1 set t2.field=t1.field
+where t1.id1=t2.id2 and 0=1;
+delete t1, t2 from t2 inner join t1 on t1.id1=t2.id2
+where 0=1;
+delete t1, t2 from t2,t1 
+where t1.id1=t2.id2 and 0=1;
+drop table t1,t2;

mysql-test/t/multi_update.test

@@ -267,3 +267,29 @@ insert into t2 values (1,1), (3,1);
 update t1 left join t2  on t1.a=t2.a set t1.b=2, t2.b=2 where t1.b=1 and t2.b=1 or t2.a is NULL;
 select t1.a, t1.b,t2.a, t2.b from t1 left join t2  on t1.a=t2.a where t1.b=1 and t2.b=1 or t2.a is NULL;
 drop table t1,t2;
+
+# Test multi-update and multi-delete with impossible where
+
+drop table if exists t1, t2;
+create table t1(id1 smallint(5), field char(5));
+create table t2(id2 smallint(5), field char(5));
+
+insert into t1 values (1, 'a'), (2, 'aa');
+insert into t2 values (1, 'b'), (2, 'bb');
+
+select * from t1;
+select * from t2;
+
+update t2 inner join t1 on t1.id1=t2.id2
+  set t2.field=t1.field
+  where 0=1;
+update t2, t1 set t2.field=t1.field
+  where t1.id1=t2.id2 and 0=1;
+
+delete t1, t2 from t2 inner join t1 on t1.id1=t2.id2
+  where 0=1;
+delete t1, t2 from t2,t1 
+  where t1.id1=t2.id2 and 0=1;
+
+drop table t1,t2;
+

sql/sql_class.h

@@ -848,6 +848,8 @@ class multi_delete : public select_result
   uint num_of_tables;
   int error;
   bool do_delete, transactional_tables, log_delayed, normal_tables;
+  bool tempfiles_inited;
+
 public:
   multi_delete(THD *thd, TABLE_LIST *dt, uint num_of_tables);
   ~multi_delete();
@@ -874,6 +876,7 @@ class multi_update : public select_result
   Copy_field *copy_field;
   enum enum_duplicates handle_duplicates;
   bool do_update, trans_safe, transactional_tables, log_delayed;
+  bool tmp_tables_inited;
 
 public:
   multi_update(THD *thd_arg, TABLE_LIST *ut, List<Item> *fields,

sql/sql_delete.cc

@@ -236,7 +236,8 @@ multi_delete::multi_delete(THD *thd_arg, TABLE_LIST *dt,
 			   uint num_of_tables_arg)
   : delete_tables(dt), thd(thd_arg), deleted(0),
     num_of_tables(num_of_tables_arg), error(0),
-    do_delete(0), transactional_tables(0), log_delayed(0), normal_tables(0)
+    do_delete(0), transactional_tables(0), log_delayed(0), normal_tables(0),
+    tempfiles_inited(0)
 {
   tempfiles = (Unique **) sql_calloc(sizeof(Unique *) * (num_of_tables-1));
 }
@@ -297,6 +298,7 @@ multi_delete::initialize_tables(JOIN *join)
 				  table->file->ref_length,
 				  MEM_STRIP_BUF_SIZE);
   }
+  tempfiles_inited= 1;
   init_ftfuncs(thd,1);
   DBUG_RETURN(thd->fatal_error != 0);
 }
@@ -422,6 +424,8 @@ int multi_delete::do_deletes(bool from_send_error)
     table_being_deleted = delete_tables;
 
   do_delete= 0;
+  if (!tempfiles_inited)
+    DBUG_RETURN(0);
   for (table_being_deleted=table_being_deleted->next;
        table_being_deleted ;
        table_being_deleted=table_being_deleted->next, counter++)

sql/sql_update.cc

@@ -440,7 +440,7 @@ multi_update::multi_update(THD *thd_arg, TABLE_LIST *table_list,
   :all_tables(table_list), update_tables(0), thd(thd_arg), tmp_tables(0),
    updated(0), found(0), fields(field_list), values(value_list),
    table_count(0), copy_field(0), handle_duplicates(handle_duplicates_arg),
-   do_update(1), trans_safe(0)
+   do_update(1), trans_safe(0), tmp_tables_inited(0)
 {}
 
 
@@ -622,6 +622,7 @@ multi_update::initialize_tables(JOIN *join)
       DBUG_RETURN(1);
     tmp_tables[cnt]->file->extra(HA_EXTRA_WRITE_CACHE);
   }
+  tmp_tables_inited= 1;
   DBUG_RETURN(0);
 }
 
@@ -819,8 +820,11 @@ int multi_update::do_updates(bool from_send_error)
   ha_rows org_updated;
   TABLE *table;
   DBUG_ENTER("do_updates");
+  
 
-  do_update= 0;					// Don't retry this function
+  do_update= 0;					// Don't retry this function  
+  if (!tmp_tables_inited)
+    DBUG_RETURN(0);
   for (cur_table= update_tables; cur_table ; cur_table= cur_table->next)
   {
     table = cur_table->table;