Optimized old patches

Don't set field to DEFAULT value when set to NULL


mysql-test/r/insert.result:
  Updated results after patch
sql/field_conv.cc:
  Revert patch: Don't set field to DEFAULT value when set to NULL
sql/item_strfunc.cc:
  Optimized patch for null handling with elt
sql/opt_range.cc:
  Safety fix for range with null patch

mysql-test/r/insert.result

@@ -65,7 +65,7 @@ insert into t1 values (1), (NULL), (2);
 select * from t1;
 id
 1
-8
+0
 2
 drop table t1;
 drop database if exists foo;

sql/field_conv.cc

-/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
+/* Copyright (C) 2000-2003 MySQL AB
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -118,7 +118,7 @@ set_field_to_null(Field *field)
     field->reset();
     return 0;
   }
-  field->set_default();
+  field->reset();
   if (current_thd->count_cuted_fields)
   {
     current_thd->cuted_fields++;		// Increment error counter
@@ -170,7 +170,7 @@ set_field_to_null_with_conversions(Field *field, bool no_conversions)
     ((Field_timestamp*) field)->set_time();
     return 0;					// Ok to set time to NULL
   }
-  field->set_default();
+  field->reset();
   if (field == field->table->next_number_field)
     return 0;					// field is set in handler.cc
   if (current_thd->count_cuted_fields)

sql/item_strfunc.cc

@@ -1546,13 +1546,11 @@ double Item_func_elt::val()
     return 0.0;
 
   double result= args[tmp-1]->val();
-  if (args[tmp-1]->is_null())
-    return 0.0;
-
-  null_value=0;
+  null_value= args[tmp-1]->null_value;
   return result;
 }
 
+
 longlong Item_func_elt::val_int()
 {
   uint tmp;
@@ -1561,13 +1559,11 @@ longlong Item_func_elt::val_int()
     return 0;
   
   int result= args[tmp-1]->val_int();
-  if (args[tmp-1]->is_null())
-    return 0;
-
-  null_value=0;
+  null_value= args[tmp-1]->null_value;
   return result;
 }
 
+
 String *Item_func_elt::val_str(String *str)
 {
   uint tmp;
@@ -1576,10 +1572,7 @@ String *Item_func_elt::val_str(String *str)
     return NULL;
 
   String *result= args[tmp-1]->val_str(str);
-  if (args[tmp-1]->is_null())
-    return NULL;
-
-  null_value=0;
+  null_value= args[tmp-1]->null_value;
   return result;
 }
 

sql/opt_range.cc

@@ -2409,7 +2409,11 @@ QUICK_SELECT *get_quick_select_for_ref(TABLE *table, TABLE_REF *ref)
   if (!quick)
     return 0;
   if (cp_buffer_from_ref(ref))
-    return quick; /* empty range */
+  {
+    if (current_thd->fatal_error)
+      return 0;					// End of memory
+    return quick;				// empty range
+  }
 
   QUICK_RANGE *range= new QUICK_RANGE();
   if (!range)