Merge mysql.com:/home/my/mysql-4.0

into  mysql.com:/home/my/mysql-4.1

sql/sql_handler.cc

@@ -384,27 +384,6 @@ int mysql_ha_read(THD *thd, TABLE_LIST *tables,
     DBUG_PRINT("info-in-hash",("'%s'.'%s' as '%s' tab %p",
                                hash_tables->db, hash_tables->real_name,
                                hash_tables->alias, table));
-    /* Table might have been flushed. */
-    if (table && (table->version != refresh_version))
-    {
-      /*
-        We must follow the thd->handler_tables chain, as we need the
-        address of the 'next' pointer referencing this table
-        for close_thread_table().
-      */
-      for (table_ptr= &(thd->handler_tables);
-           *table_ptr && (*table_ptr != table);
-           table_ptr= &(*table_ptr)->next)
-      {}
-      VOID(pthread_mutex_lock(&LOCK_open));
-      if (close_thread_table(thd, table_ptr))
-      {
-        /* Tell threads waiting for refresh that something has happened */
-        VOID(pthread_cond_broadcast(&COND_refresh));
-      }
-      VOID(pthread_mutex_unlock(&LOCK_open));
-      table= hash_tables->table= NULL;
-    }
     if (!table)
     {
       /*
@@ -451,6 +430,13 @@ int mysql_ha_read(THD *thd, TABLE_LIST *tables,
   }
   tables->table=table;
 
+  HANDLER_TABLES_HACK(thd);
+  lock= mysql_lock_tables(thd, &tables->table, 1, 0);
+  HANDLER_TABLES_HACK(thd);
+
+  if (!lock)
+    goto err0; // mysql_lock_tables() printed error message already
+
   if (cond && ((!cond->fixed &&
               cond->fix_fields(thd, tables, &cond)) || cond->check_cols(1)))
     goto err0;
@@ -468,16 +454,6 @@ int mysql_ha_read(THD *thd, TABLE_LIST *tables,
   if (insert_fields(thd,tables,tables->db,tables->alias,&it))
     goto err0;
 
-  select_limit+=offset_limit;
-  protocol->send_fields(&list,1);
-
-  HANDLER_TABLES_HACK(thd);
-  lock= mysql_lock_tables(thd, &tables->table, 1, 0);
-  HANDLER_TABLES_HACK(thd);
-
-  if (!lock)
-     goto err0; // mysql_lock_tables() printed error message already
-
   /*
     In ::external_lock InnoDB resets the fields which tell it that
     the handle is used in the HANDLER interface. Tell it again that

sql/sql_select.cc

@@ -5292,7 +5292,14 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
       *(reg_field++) =new_field;
     }
     if (!--hidden_field_count)
+    {
       hidden_null_count=null_count;
+      /*
+        We need to update hidden_field_count as we may have stored group
+        functions with constant arguments
+      */
+      param->hidden_field_count= (uint) (reg_field - table->field);
+    }
   }
   DBUG_ASSERT(field_count >= (uint) (reg_field - table->field));
   field_count= (uint) (reg_field - table->field);
@@ -5488,7 +5495,7 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
     }
   }
 
-  if (distinct)
+  if (distinct && field_count != param->hidden_field_count)
   {
     /*
       Create an unique key or an unique constraint over all columns