diff -Naru ./mysql-5.1.36/sql/ha_partition.cc ./mysql-5.1.36-partition_cond_push/sql/ha_partition.cc
--- ./mysql-5.1.36/sql/ha_partition.cc	2009-06-16 21:29:45.000000000 +0900
+++ ./mysql-5.1.36-partition_cond_push/sql/ha_partition.cc	2009-07-03 15:48:06.000000000 +0900
@@ -6324,6 +6324,37 @@
   return error;
 }
 
+const COND *ha_partition::cond_push(const COND *cond)
+{
+  handler **file= m_file;
+  COND *res_cond = NULL;
+  DBUG_ENTER("ha_partition::cond_push");
+
+  do
+  {
+    if ((*file)->pushed_cond != cond)
+    {
+      if ((*file)->cond_push(cond))
+        res_cond = (COND *) cond;
+      else
+        (*file)->pushed_cond = cond;
+    }
+  } while (*(++file));
+  DBUG_RETURN(res_cond);
+}
+
+void ha_partition::cond_pop()
+{
+  handler **file= m_file;
+  DBUG_ENTER("ha_partition::cond_push");
+
+  do
+  {
+    (*file)->cond_pop();
+  } while (*(++file));
+  DBUG_VOID_RETURN;
+}
+
 
 /****************************************************************************
                 MODULE Partition Share
diff -Naru ./mysql-5.1.36/sql/ha_partition.h ./mysql-5.1.36-partition_cond_push/sql/ha_partition.h
--- ./mysql-5.1.36/sql/ha_partition.h	2009-06-16 21:29:45.000000000 +0900
+++ ./mysql-5.1.36-partition_cond_push/sql/ha_partition.h	2009-07-03 15:47:42.000000000 +0900
@@ -1050,6 +1050,14 @@
     virtual bool auto_repair() const;
     virtual bool is_crashed() const;
 
+  /*
+    -------------------------------------------------------------------------
+    MODULE condition pushdown
+    -------------------------------------------------------------------------
+  */
+    virtual const COND *cond_push(const COND *cond);
+    virtual void cond_pop();
+
     private:
     int handle_opt_partitions(THD *thd, HA_CHECK_OPT *check_opt, uint flags);
     public:
diff -Naru ./mysql-5.1.36/sql/handler.cc ./mysql-5.1.36-partition_cond_push/sql/handler.cc
--- ./mysql-5.1.36/sql/handler.cc	2009-06-16 21:29:45.000000000 +0900
+++ ./mysql-5.1.36-partition_cond_push/sql/handler.cc	2009-07-03 15:49:13.000000000 +0900
@@ -4584,6 +4584,7 @@
   free_io_cache(table);
   /* reset the bitmaps to point to defaults */
   table->default_column_bitmaps();
+  pushed_cond = NULL;
   DBUG_RETURN(reset());
 }