Merge from 4.1 to 5.0

mysql-test/r/loaddata.result:
  Add drop tablea after test case
mysql-test/r/type_decimal.result:
  Update warnings
mysql-test/r/union.result:
  Miss in merge
mysql-test/t/loaddata.test:
  Add drop table after test case
sql/opt_sum.cc:
  Add missing }
sql/sql_load.cc:
  Manual merge

mysql-test/r/loaddata.result

@@ -76,6 +76,7 @@ select * from t1;
 id
 0
 SET @@SQL_MODE=@OLD_SQL_MODE;
+drop table t1;
 create table t1 (a int default 100, b int, c varchar(60));
 load data infile '../../std_data/rpl_loaddata.dat' into table t1 (a, @b) set b=@b+10, c=concat("b=",@b);
 select * from t1;

mysql-test/r/type_decimal.result

@@ -674,9 +674,11 @@ a
 drop table t1;
 create table t1(a decimal(10,5), b decimal(10,1));
 insert into t1 values(123.12345, 123.12345);
+Warnings:
+Note	1265	Data truncated for column 'b' at row 1
 update t1 set b=a;
 Warnings:
-Warning	1265	Data truncated for column 'b' at row 1
+Note	1265	Data truncated for column 'b' at row 1
 select * from t1;
 a	b
 123.12345	123.1

mysql-test/r/union.result

@@ -780,21 +780,6 @@ t1	CREATE TABLE `t1` (
   `b` longblob
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 drop table t1,t2;
-create table t1 (d decimal(10,1));
-create table t2 (d decimal(10,9));
-insert into t1 values ("100000000.0");
-insert into t2 values ("1.23456780");
-create table t3 select * from t2 union select * from t1;
-select * from t3;
-d
-1.234567800
-100000000.000000000
-show create table t3;
-Table	Create Table
-t3	CREATE TABLE `t3` (
-  `d` decimal(18,9) default NULL
-) ENGINE=MyISAM DEFAULT CHARSET=latin1
-drop table t1,t2,t3;
 create table t1 select 1 union select -1;
 select * from t1;
 1

mysql-test/t/loaddata.test

@@ -57,6 +57,7 @@ enable_query_log;
 select * from t1;
 --exec rm $MYSQL_TEST_DIR/var/tmp/t1
 SET @@SQL_MODE=@OLD_SQL_MODE;
+drop table t1;
 
 # End of 4.1 tests
 

sql/opt_sum.cc

@@ -167,6 +167,7 @@ int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds)
           {
             ((Item_sum_count*) item)->make_const(count);
             recalc_const_item= 1;
+          }
         }
         else
           const_result= 0;

sql/sql_load.cc

@@ -677,8 +677,6 @@ read_sep_field(THD *thd, COPY_INFO &info, TABLE_LIST *table_list,
       pos=read_info.row_start;
       length=(uint) (read_info.row_end-pos);
 
-      if (field == table->next_number_field)
-        table->auto_increment_field_not_null= TRUE;
       if (!read_info.enclosed &&
 	  (enclosed_length && length == 4 && !memcmp(pos,"NULL",4)) ||
 	  (length == 1 && read_info.found_null))
@@ -688,6 +686,8 @@ read_sep_field(THD *thd, COPY_INFO &info, TABLE_LIST *table_list,
           Field *field= ((Item_field *)item)->field;
           field->reset();
           field->set_null();
+          if (field == table->next_number_field)
+            table->auto_increment_field_not_null= TRUE;
           if (!field->maybe_null())
           {
             if (field->type() == FIELD_TYPE_TIMESTAMP)
@@ -705,9 +705,12 @@ read_sep_field(THD *thd, COPY_INFO &info, TABLE_LIST *table_list,
 
       if (item->type() == Item::FIELD_ITEM)
       {
+
         Field *field= ((Item_field *)item)->field;
         field->set_notnull();
         read_info.row_end[0]=0;			// Safe to change end marker
+        if (field == table->next_number_field)
+          table->auto_increment_field_not_null= TRUE;
         field->store((char*) pos, length, read_info.read_charset);
       }
       else