Changes for the furtherment of UNIONS

sql/sql_class.h

@@ -481,12 +481,13 @@ class select_insert :public select_result {
   uint save_time_stamp;
   ulonglong last_insert_id;
   COPY_INFO info;
+	bool unions;
 
-  select_insert(TABLE *table_par,List<Item> *fields_par,enum_duplicates duplic)
+  select_insert(TABLE *table_par,List<Item> *fields_par,enum_duplicates duplic, bool u=false)
     :table(table_par),fields(fields_par), save_time_stamp(0),last_insert_id(0)
     {
       bzero((char*) &info,sizeof(info));
-      info.handle_duplicates=duplic;
+      info.handle_duplicates=duplic; unions = u;
     }
   ~select_insert();
   int prepare(List<Item> &list);
@@ -511,8 +512,8 @@ class select_create: public select_insert {
 		 HA_CREATE_INFO *create_info_par,
 		 List<create_field> &fields_par,
 		 List<Key> &keys_par,
-		 List<Item> &select_fields,enum_duplicates duplic)
-    :select_insert (NULL, &select_fields, duplic), db(db_name),
+		 List<Item> &select_fields,enum_duplicates duplic, bool u=false)
+    :select_insert (NULL, &select_fields, duplic, u), db(db_name),
     name(table_name), extra_fields(&fields_par),keys(&keys_par),
     create_info(create_info_par),
     lock(0)

sql/sql_insert.cc

@@ -1318,7 +1318,8 @@ bool select_insert::send_eof()
 	      thd->cuted_fields);
     if (last_insert_id)
       thd->insert_id(last_insert_id);		// For update log
-    ::send_ok(&thd->net,info.copied,last_insert_id,buff);
+		if (!unions)
+			::send_ok(&thd->net,info.copied,last_insert_id,buff);
     mysql_update_log.write(thd,thd->query,thd->query_length);
     if (mysql_bin_log.is_open())
     {
@@ -1400,7 +1401,9 @@ bool select_create::send_eof()
     mysql_unlock_tables(thd, lock);
     if (!table->tmp_table)
       hash_delete(&open_cache,(byte*) table);
-    lock=0; table=0;
+    lock=0; 
+		if (!unions)
+			table=0;
     VOID(pthread_mutex_unlock(&LOCK_open));
   }
   return tmp;

sql/sql_parse.cc

@@ -1754,7 +1754,15 @@ mysql_execute_command(void)
       break;
     }
     if (!(res=open_and_lock_tables(thd,(TABLE_LIST *)total->first)))
+		{
+    /* Fix tables--to-be-unioned-from list to point at opened tables */
+			for (SELECT_LEX *sl=&lex->select_lex;sl;sl=sl->next)
+			{
+				for (TABLE_LIST *cursor=(TABLE_LIST *)sl->table_list.first;cursor;cursor=cursor->next)
+					cursor->table= ((TABLE_LIST*) cursor->table)->table;
+			}
       res=mysql_union(thd,lex, select_lex->select_number+1);
+		}
     close_thread_tables(thd);
     break;
   }
@@ -2894,11 +2902,12 @@ TABLE_LIST *add_table_to_list(Table_ident *table, LEX_STRING *alias,
 static int link_in_large_list_and_check_acl(THD *thd,LEX *lex,SQL_LIST *tables)
 {
   SELECT_LEX *sl; const char *current_db=thd->db ? thd->db : "";
+	TABLE_LIST *ptr;
   for (sl=&lex->select_lex;sl;sl=sl->next)
   {
     if ((lex->sql_command == SQLCOM_UNION_SELECT) && (sl->order_list.first != (byte *)NULL) && (sl->next != (st_select_lex  *)NULL))
     {
-      net_printf(&thd->net,ER_ILLEGAL_GRANT_FOR_TABLE);  // correct error message will come here; only last SELECt can have ORDER BY
+      net_printf(&thd->net,ER_ILLEGAL_GRANT_FOR_TABLE);  // correct error message will come here; only last SELECT can have ORDER BY
       return -1;
     }
     if (sl->table_list.first == (byte *)NULL) continue;
@@ -2919,7 +2928,15 @@ static int link_in_large_list_and_check_acl(THD *thd,LEX *lex,SQL_LIST *tables)
 	  aux->lock_type= lex->lock_option;
 	  if (!tables->next)
 	    tables->next= (byte**) &tables->first;
-	  link_in_list(tables,(byte*)aux,(byte**) &aux->next);
+		if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
+			return 1;
+		ptr->db= aux->db; ptr->real_name=aux->real_name;
+		ptr->name=aux->name;  ptr->lock_type=aux->lock_type;
+		ptr->updating=aux->updating;
+    ptr->use_index=aux->use_index;
+    ptr->ignore_index=aux->use_index;
+    aux->table=(TABLE *)ptr;
+	  link_in_list(tables,(byte*)ptr,(byte**) &ptr->next);
 	}
       }
     }

sql/sql_unions.cc

@@ -29,7 +29,8 @@
 int mysql_union(THD *thd,LEX *lex,uint no_of_selects) 
 {
   SELECT_LEX *sl, *for_order=&lex->select_lex; uint no=0; int res=0;
-  List<Item> fields;     TABLE *table=(TABLE *)NULL; TABLE_LIST *resulting=(TABLE_LIST *)NULL;
+	select_create *create_result;
+  List<Item> fields; TABLE *table=(TABLE *)NULL; TABLE_LIST *resulting=(TABLE_LIST *)NULL;
   for (;for_order->next;for_order=for_order->next);
   ORDER *some_order = (ORDER *)for_order->order_list.first;
   for (sl=&lex->select_lex;sl;sl=sl->next, no++)
@@ -37,102 +38,110 @@ int mysql_union(THD *thd,LEX *lex,uint no_of_selects)
     TABLE_LIST *tables=(TABLE_LIST*) sl->table_list.first;
     if (!no) // First we do CREATE from SELECT
     {
-      select_create *result;
       lex->create_info.options=HA_LEX_CREATE_TMP_TABLE;
-      if ((result=new select_create(tables->db ? tables->db : thd->db,
-				    NULL, &lex->create_info,
+			lex->create_info.db_type=DB_TYPE_MYISAM;
+      lex->create_info.row_type = ROW_TYPE_DEFAULT;
+			lex->create_info.avg_row_length = 0;
+			lex->create_info.max_rows=INT_MAX; lex->create_info.min_rows=0;
+			lex->create_info.comment=lex->create_info.password=NullS;
+			lex->create_info.data_file_name=lex->create_info.index_file_name=NullS;
+			lex->create_info.raid_type=lex->create_info.raid_chunks=0;
+			lex->create_info.raid_chunksize=0;
+			lex->create_info.if_not_exists=false;
+			lex->create_info.used_fields=0;
+
+      if ((create_result=new select_create(tables->db ? tables->db : thd->db,
+				    "ZVEK", &lex->create_info,
 				    lex->create_list,
 				    lex->key_list,
-				    sl->item_list,DUP_IGNORE)))
+				    sl->item_list,DUP_IGNORE,true)))
       {
-	res=mysql_select(thd,tables,sl->item_list,
-			 sl->where,
-			 sl->ftfunc_list,
-			 (ORDER*) NULL,
-			 (ORDER*) sl->group_list.first,
-			 sl->having,
-			 (ORDER*) some_order,
-			 sl->options | thd->options,
-			 result);
-	if (res) 
-	{
-	  result->abort();
-	  delete result;
-	  return res;
-	}
-	table=result->table;
-	List_iterator<Item> it(*(result->fields));
-	Item *item;
-	while ((item= it++))
-	  fields.push_back(item);
-	delete result;
-	if (!reopen_table(table)) return 1;
-	if (!(resulting = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
-	  return 1;
-	resulting->db=tables->db ? tables->db : thd->db;
-	resulting->real_name=table->real_name;
-	resulting->name=table->table_name;
-	resulting->table=table;
+				res=mysql_select(thd,tables,sl->item_list,
+												 sl->where,
+												 sl->ftfunc_list,
+												 (ORDER*) NULL,
+												 (ORDER*) sl->group_list.first,
+												 sl->having,
+												 (ORDER*) some_order,
+												 sl->options | thd->options,
+												 create_result);
+				if (res) 
+				{
+					create_result->abort();
+					delete create_result;
+					return res;
+				}
+				table=create_result->table;
+				List_iterator<Item> it(*(create_result->fields));
+				Item *item;
+				while ((item= it++))
+					fields.push_back(item);
+				if (!(resulting = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
+					return 1;
+				resulting->db=tables->db ? tables->db : thd->db;
+				resulting->real_name=table->real_name;
+				resulting->name=table->table_name;
+				resulting->table=table;
       }
       else
-	return -1;
+				return -1;
     }
     else // Then we do INSERT from SELECT
     {
       select_result *result;
-      if ((result=new select_insert(table, &fields, DUP_IGNORE)))
+      if ((result=new select_insert(table, &fields, DUP_IGNORE, true)))
       {
-	res=mysql_select(thd,tables,sl->item_list,
-			 sl->where,
+				res=mysql_select(thd,tables,sl->item_list,
+												 sl->where,
                          sl->ftfunc_list,
-			 (ORDER*) some_order,
-			 (ORDER*) sl->group_list.first,
-			 sl->having,
-			 (ORDER*) NULL,
-			 sl->options | thd->options,
-			 result);
-	delete result;
-	if (res) return 1;
+												 (ORDER*) some_order,
+												 (ORDER*) sl->group_list.first,
+												 sl->having,
+												 (ORDER*) NULL,
+												 sl->options | thd->options,
+												 result);
+				delete result;
+				if (res) 
+				{
+					delete create_result;
+					return 1;
+				}
       }
       else
-	return -1;
+			{
+				delete create_result;
+				return -1;
+			}
     }
   }
   select_result *result;
   List<Item> item_list;
   List<Item_func_match> ftfunc_list;
   ftfunc_list.empty();
-  if (item_list.push_back(new Item_field(NULL,NULL,"*")))
-    return -1;
+  void(item_list.push_back(new Item_field(NULL,NULL,"*")));
   if (lex->exchange)
   {
     if (lex->exchange->dumpfile)
-    {
-      if (!(result=new select_dump(lex->exchange)))
-	return -1;
-    }
+      result=new select_dump(lex->exchange);
     else
-    {
-      if (!(result=new select_export(lex->exchange)))
-	return -1;
-    }
+      result=new select_export(lex->exchange);
   }
-  else if (!(result=new select_send()))
-    return -1;
-  else
+  else result=new select_send();
+  if (result)
   {
     res=mysql_select(thd,resulting,item_list,
-		     NULL,
-		     ftfunc_list,
-		     (ORDER*) NULL,
-		     (ORDER*) NULL,
-		     NULL,
-		     (ORDER*) NULL,
-		     thd->options,
-		     result);
+										 NULL,
+										 ftfunc_list,
+										 (ORDER*) NULL,
+										 (ORDER*) NULL,
+										 NULL,
+										 (ORDER*) NULL,
+										 thd->options,
+										 result);
     if (res)
       result->abort();
+		delete result;
   }
-  delete result;
+  delete create_result;
   return res;
 }