SCRUM

DEFAULT in SELECT & UPDATE corrections


mysql-test/r/replace.result:
  test slightly extended
mysql-test/t/replace.test:
  test slightly extended with replace(default)
sql/item.cc:
  DEFAULT_ITEM replaced
sql/item.h:
  some modifications after talking with Sergey

mysql-test/r/replace.result

@@ -12,15 +12,17 @@ replace into t1 (gesuchnr,benutzer_id) values (1,1);
 alter table t1 type=heap;
 replace into t1 (gesuchnr,benutzer_id) values (1,1);
 drop table t1;
-create table t1 (a tinyint not null auto_increment primary key, b char(20));
-insert into t1 values (126,"first"),(0,"last");
+create table t1 (a tinyint not null auto_increment primary key, b char(20) default "default_value");
+insert into t1 values (126,"first"),(63, "middle"),(0,"last");
 insert into t1 values (0,"error");
 Duplicate entry '127' for key 1
 replace into t1 values (0,"error");
 Duplicate entry '127' for key 1
 replace into t1 values (126,"first updated");
+replace into t1 values (63,default);
 select * from t1;
 a	b
 126	first updated
+63	default_value
 127	last
 drop table t1;

mysql-test/t/replace.test

@@ -27,12 +27,13 @@ drop table t1;
 # Test when using replace on a key that has used up it's whole range
 #
 
-create table t1 (a tinyint not null auto_increment primary key, b char(20));
-insert into t1 values (126,"first"),(0,"last");
+create table t1 (a tinyint not null auto_increment primary key, b char(20) default "default_value");
+insert into t1 values (126,"first"),(63, "middle"),(0,"last");
 --error 1062
 insert into t1 values (0,"error");
 --error 1062
 replace into t1 values (0,"error");
 replace into t1 values (126,"first updated");
+replace into t1 values (63,default);
 select * from t1;
 drop table t1;

sql/item.cc

@@ -1128,7 +1128,7 @@ bool Item_ref::check_loop(uint id)
 
 bool Item_default_value::eq(const Item *item, bool binary_cmp) const
 {
-  return item->type() == DEFAULT_ITEM && 
+  return item->type() == DEFAULT_VALUE_ITEM && 
     ((Item_default_value *)item)->arg->eq(arg, binary_cmp);
 }
 
@@ -1167,6 +1167,7 @@ void Item_default_value::print(String *str)
   if (!arg)
   {
     str->append("DEFAULT");
+    return;
   }
   str->append("DEFAULT(");
   arg->print(str);

sql/item.h

@@ -33,7 +33,7 @@ class Item {
 
   enum Type {FIELD_ITEM, FUNC_ITEM, SUM_FUNC_ITEM, STRING_ITEM,
 	     INT_ITEM, REAL_ITEM, NULL_ITEM, VARBIN_ITEM,
-	     COPY_STR_ITEM, FIELD_AVG_ITEM, DEFAULT_ITEM,
+	     COPY_STR_ITEM, FIELD_AVG_ITEM, DEFAULT_VALUE_ITEM,
 	     PROC_ITEM,COND_ITEM, REF_ITEM, FIELD_STD_ITEM, 
 	     FIELD_VARIANCE_ITEM, CONST_ITEM,
              SUBSELECT_ITEM, ROW_ITEM, CACHE_ITEM};
@@ -663,7 +663,7 @@ class Item_default_value : public Item_field
     Item_field((const char *)NULL, (const char *)NULL, (const char *)NULL), arg(NULL) {}
   Item_default_value(Item *a) : 
     Item_field((const char *)NULL, (const char *)NULL, (const char *)NULL), arg(a) {}
-  enum Type type() const { return DEFAULT_ITEM; }
+  enum Type type() const { return DEFAULT_VALUE_ITEM; }
   bool eq(const Item *item, bool binary_cmp) const;
   bool fix_fields(THD *, struct st_table_list *, Item **);
   bool check_loop(uint id)
@@ -682,12 +682,7 @@ class Item_default_value : public Item_field
     }
     return Item_field::save_in_field(field, no_conversions);
   }
-  table_map used_tables() const
-  { 
-    if (!arg)
-      return (table_map) 0L; 
-    return Item_field::used_tables();
-  }
+  table_map used_tables() const { return (table_map)0L; }
 };
 
 class Item_cache: public Item