Making multi-table delete BETA !!

.bzrignore

@@ -368,3 +368,4 @@ libmysqld/hash_filo.cc
 libmysqld/sql_unions.cc
 libmysqld/stacktrace.c
 sql/share/mysql
+locked

mysql-test/t/multi_update.test

@@ -7,7 +7,7 @@ eval select $BIG_TEST as using_big_test;
 
 drop table if exists t1,t2,t3;
 create table t1(id1 int not null auto_increment primary key, t char(12));
-create table t2(id2 int not null, t char(12), index(id2));
+create table t2(id2 int not null, t char(12));
 create table t3(id3 int not null, t char(12), index(id3));
 let $1 = 10000;
 while ($1)

mysys/my_compress.c

@@ -15,7 +15,7 @@
    Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
    MA 02111-1307, USA */
 
-/* Written by Sinisa Milivojevic <sinisa@coresinc.com> */
+/* Written by Sinisa Milivojevic <sinisa@mysql.com> */
 
 #include <global.h>
 #ifdef HAVE_COMPRESS

sql/filesort.cc

@@ -685,7 +685,6 @@ int merge_buffers(SORTPARAM *param, IO_CACHE *from_file,
   uchar *strpos;
   BUFFPEK *buffpek,**refpek;
   QUEUE queue;
-  volatile bool *killed= &current_thd->killed;
   qsort2_cmp    cmp;
   DBUG_ENTER("merge_buffers");
 
@@ -739,10 +738,6 @@ int merge_buffers(SORTPARAM *param, IO_CACHE *from_file,
 
   while (queue.elements > 1)
   {
-    if (*killed)
-    {
-      error=1; goto err;			/* purecov: inspected */
-    }
     for (;;)
     {
       buffpek=(BUFFPEK*) queue_top(&queue);

sql/sql_class.h

@@ -410,6 +410,8 @@ public:
 ** This is used to get result from a select
 */
 
+class JOIN;
+
 class select_result :public Sql_alloc {
 protected:
   THD *thd;
@@ -419,6 +421,7 @@ public:
   virtual int prepare(List<Item> &list) { return 0; }
   virtual bool send_fields(List<Item> &list,uint flag)=0;
   virtual bool send_data(List<Item> &items)=0;
+  virtual void initialize_tables (JOIN *join=0) {};
   virtual void send_error(uint errcode,const char *err)=0;
   virtual bool send_eof()=0;
   virtual void abort() {}
@@ -621,6 +624,7 @@ public:
    bool send_fields(List<Item> &list,
  		   uint flag) { return 0; }
    bool send_data(List<Item> &items);
+   void initialize_tables (JOIN *join);
    void send_error(uint errcode,const char *err);
    int  do_deletes (bool from_send_error);
    bool send_eof();

sql/sql_delete.cc

-/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
+/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB & Sinisa
    
    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
@@ -19,6 +19,7 @@
 
 #include "mysql_priv.h"
 #include "ha_innobase.h"
+#include "sql_select.h"
 
 /*
   Optimize delete of all rows by doing a full generate of the table
@@ -319,12 +320,14 @@ multi_delete::multi_delete(THD *thd_arg, TABLE_LIST *dt,
 #endif
 
   (void) dt->table->file->extra(HA_EXTRA_NO_READCHECK);
+  (void) dt->table->file->extra(HA_EXTRA_NO_KEYREAD);
   /* Don't use key read with MULTI-TABLE-DELETE */
   dt->table->used_keys=0;
   for (dt=dt->next ; dt ; dt=dt->next,counter++)
   {
     TABLE *table=dt->table;
-    (void) table->file->extra(HA_EXTRA_NO_READCHECK);
+  (void) dt->table->file->extra(HA_EXTRA_NO_READCHECK);
+  (void) dt->table->file->extra(HA_EXTRA_NO_KEYREAD);
 #ifdef SINISAS_STRIP
     tempfiles[counter]=(IO_CACHE *) sql_alloc(sizeof(IO_CACHE));
     if (open_cached_file(tempfiles[counter], mysql_tmpdir,TEMP_PREFIX,
@@ -367,6 +370,39 @@ multi_delete::prepare(List<Item> &values)
   DBUG_RETURN(0);
 }
 
+inline static void
+link_in_list(SQL_LIST *list,byte *element,byte **next)
+{
+  list->elements++;
+  (*list->next)=element;
+  list->next=next;
+  *next=0;
+}
+
+void
+multi_delete::initialize_tables(JOIN *join)
+{
+  SQL_LIST *new_list=(SQL_LIST *) sql_alloc(sizeof(SQL_LIST));
+  new_list->elements=0;  new_list->first=0;
+  new_list->next= (byte**) &(new_list->first);
+  for (JOIN_TAB *tab=join->join_tab, *end=join->join_tab+join->tables;
+       tab < end;
+       tab++)
+  {
+    TABLE_LIST *walk;
+    for (walk=(TABLE_LIST*) delete_tables ; walk ; walk=walk->next)
+      if (!strcmp(tab->table->path,walk->table->path))
+	break;
+    if (walk) // Table need not be the one to be deleted
+    {
+      register TABLE_LIST *ptr = (TABLE_LIST *) sql_alloc(sizeof(TABLE_LIST));
+      memcpy(ptr,walk,sizeof(TABLE_LIST)); ptr->next=0;
+      link_in_list(new_list,(byte*) ptr,(byte**) &ptr->next);
+    }
+  }
+  delete_tables=(TABLE_LIST *)new_list->first;
+  return;
+}
 
 multi_delete::~multi_delete()
 {

sql/sql_select.cc

@@ -385,6 +385,7 @@ mysql_select(THD *thd,TABLE_LIST *tables,List<Item> &fields,COND *conds,
       thd->fatal_error)
     goto err;
   thd->proc_info="preparing";
+  result->initialize_tables(&join);
   if ((tmp=join_read_const_tables(&join)) > 0)
     goto err;
   if (tmp && !(select_options & SELECT_DESCRIBE))