fixed restoring of thd->count_cuted_fields in store_val_in_field

(fixed #bug 2012)

mysql-test/r/insert_select.result

@@ -11,3 +11,15 @@ payoutID
 19
 20
 22
+Month	Type	Field	Count
+2003-09-01	1	1	100
+2003-09-01	1	2	100
+2003-09-01	2	1	100
+2003-09-01	2	2	100
+2003-09-01	3	1	100
+NULL	Field	Count
+NULL	1	100
+NULL	2	100
+No	Field	Count
+0	1	100
+0	2	100

mysql-test/t/insert_select.test

@@ -10,3 +10,34 @@ insert into t2 (payoutID) SELECT DISTINCT payoutID FROM t1;
 insert into t2 (payoutID) SELECT payoutID+10 FROM t1;
 select * from t2;
 drop table t1,t2;
+
+#
+# Another problem from Bug #2012
+#
+
+CREATE TABLE t1(
+ Month date NOT NULL,
+ Type tinyint(3) unsigned NOT NULL auto_increment,
+ Field int(10) unsigned NOT NULL,
+ Count int(10) unsigned NOT NULL,
+ UNIQUE KEY Month (Month,Type,Field)
+);
+	  
+insert into t1 Values
+(20030901, 1, 1, 100),
+(20030901, 1, 2, 100),
+(20030901, 2, 1, 100),
+(20030901, 2, 2, 100),
+(20030901, 3, 1, 100);
+
+select * from t1;
+	  
+Select null, Field, Count From t1 Where Month=20030901 and Type=2;
+	  
+create table t2(No int not null, Field int not null, Count int not null);
+	  
+insert into t2 Select null, Field, Count From t1 Where Month=20030901 and Type=2;
+	  
+select * from t2;
+
+drop table t1, t2;

sql/sql_select.cc

@@ -2184,9 +2184,15 @@ store_val_in_field(Field *field,Item *item)
 {
   THD *thd=current_thd;
   ulong cuted_fields=thd->cuted_fields;
+  /*
+    we should restore old value of count_cuted_fields because
+    store_val_in_field can be called from mysql_insert 
+    with select_insert, which make count_cuted_fields= 1
+   */
+  bool old_count_cuted_fields= thd->count_cuted_fields;
   thd->count_cuted_fields=1;
   item->save_in_field(field);
-  thd->count_cuted_fields=0;
+  thd->count_cuted_fields= old_count_cuted_fields;
   return cuted_fields != thd->cuted_fields;
 }