BUG#16806: ALTER TABLE with new field in before position fails

Review fixes

sql/sql_partition.cc

@@ -1741,8 +1741,7 @@ bool fix_partition_func(THD *thd, const char* name, TABLE *table,
   tables.db= db_name;
 
   if (!is_create_table_ind ||
-      (is_create_table_ind &&
-       thd->lex->sql_command != SQLCOM_CREATE_TABLE))
+       thd->lex->sql_command != SQLCOM_CREATE_TABLE)
   {
     if (partition_default_handling(table, part_info,
                                    is_create_table_ind,
@@ -3770,7 +3769,24 @@ bool mysql_unpack_partition(THD *thd, const uchar *part_buf,
       }
     }
     else
+    {
+      /*
+        When we come here we are doing a create table. In this case we
+        have already done some preparatory work on the old part_info
+        object. We don't really need this new partition_info object.
+        Thus we go back to the old partition info object.
+        We need to free any memory objects allocated on item_free_list
+        by the parser since we are keeping the old info from the first
+        parser call in CREATE TABLE.
+        We'll ensure that this object isn't put into table cache also
+        just to ensure we don't get into strange situations with the
+        item objects.
+      */
+      free_items(thd->free_list);
       part_info= thd->work_part_info;
+      thd->free_list= NULL;
+      table->s->version= 0UL;
+    }
   }
   table->part_info= part_info;
   table->file->set_part_info(part_info);

sql/sql_table.cc

@@ -2154,24 +2154,22 @@ bool mysql_create_table_internal(THD *thd,
       */
       if (part_info->use_default_no_partitions &&
           part_info->no_parts &&
-          part_info->no_parts != file->get_default_no_partitions(0ULL))
+          (int)part_info->no_parts != file->get_default_no_partitions(0ULL))
       {
-        uint i= 0;
-        bool first= TRUE;
+        uint i;
         List_iterator<partition_element> part_it(part_info->partitions);
-        do
-        {
-          partition_element *part_elem= part_it++;
-          if (!first)
-            part_elem->part_state= PART_TO_BE_DROPPED;
-          first= FALSE;
-        } while (++i < part_info->partitions.elements);
+        part_it++;
+        DBUG_ASSERT(thd->lex->sql_command != SQLCOM_CREATE_TABLE);
+        for (i= 1; i < part_info->partitions.elements; i++)
+          (part_it++)->part_state= PART_TO_BE_DROPPED;
       }
       else if (part_info->is_sub_partitioned() &&
                part_info->use_default_no_subpartitions &&
                part_info->no_subparts &&
-               part_info->no_subparts != file->get_default_no_partitions(0ULL))
+               (int)part_info->no_subparts !=
+                 file->get_default_no_partitions(0ULL))
       {
+        DBUG_ASSERT(thd->lex->sql_command != SQLCOM_CREATE_TABLE);
         part_info->no_subparts= file->get_default_no_partitions(0ULL);
       }
     }