New status variables: Rows_tmp_read, Handler_tmp_update and Handler_tmp_write

Split status variable Rows_read to Rows_read and Rows_tmp_read so that one can see how much real data is read.
Same was done with with Handler_update and Handler_write.
Fixed bug in MEMORY tables where some variables was counted twice.
Added new internal handler call 'ha_close()' to have one place to gather statistics.
Fixed bug where thd->open_options was set to wrong value when doing admin_recreate_table()


mysql-test/r/status.result:
  Updated test results and added new tests
mysql-test/r/status_user.result:
  Udated test results
mysql-test/t/status.test:
  Added new test for temporary table status variables
sql/ha_partition.cc:
  Changed to call ha_close() instead of close()
sql/handler.cc:
  Added internal_tmp_table variable for easy checking of temporary tables.
  Added new internal handler call 'ha_close()' to have one place to gather statistics.
  Gather statistics for internal temporary tables.
sql/handler.h:
  Added handler variables internal_tmp_table, rows_tmp_read.
  Split function update_index_statistics() to two.
  Added ha_update_tmp_row() for faster tmp table handling with more statistics.
sql/item_sum.cc:
  ha_write_row() -> ha_write_tmp_row()
sql/multi_range_read.cc:
  close() -> ha_close()
sql/mysqld.cc:
  New status variables: Rows_tmp_read, Handler_tmp_update and Handler_tmp_write
sql/opt_range.cc:
  close() -> ha_close()
sql/sql_base.cc:
  close() -> ha_close()
sql/sql_class.cc:
  Added handling of rows_tmp_read
sql/sql_class.h:
  Added new satistics variables.
  rows_read++  ->  update_rows_read() to be able to correctly count reads to internal temp tables.
  Added handler::ha_update_tmp_row()
sql/sql_connect.cc:
  Added comment
sql/sql_expression_cache.cc:
  ha_write_row() -> ha_write_tmp_row()
sql/sql_select.cc:
  close() -> ha_close()
  ha_update_row() -> ha_update_tmp_row()
sql/sql_show.cc:
  ha_write_row() -> ha_write_tmp_row()
sql/sql_table.cc:
  Fixed bug where thd->open_options was set to wrong value when doing admin_recreate_table()
sql/sql_union.cc:
  ha_write_row() -> ha_write_tmp_row()
sql/sql_update.cc:
  ha_write_row() -> ha_write_tmp_row()
sql/table.cc:
  close() -> ha_close()
storage/heap/ha_heap.cc:
  Removed double counting of statistic variables.
  close -> ha_close() to get tmp table statistics.
storage/maria/ha_maria.cc:
  close -> ha_close() to get tmp table statistics.

sql/handler.h

@@ -1,4 +1,5 @@
 /* Copyright 2000-2008 MySQL AB, 2008 Sun Microsystems, Inc.
+   Copyright 2009-2011 Monty Program Ab
 
    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
@@ -1599,6 +1600,7 @@ public:
   KEY_PART_INFO *range_key_part;
   int key_compare_result_on_equal;
   bool eq_range;
+  bool internal_tmp_table;                      /* If internal tmp table */
 
   /* 
     TRUE <=> the engine guarantees that returned records are within the range
@@ -1643,6 +1645,7 @@ public:
   */
   /* Statistics  variables */
   ulonglong rows_read;
+  ulonglong rows_tmp_read;
   ulonglong rows_changed;
   /* One bigger than needed to avoid to test if key == MAX_KEY */
   ulonglong index_rows_read[MAX_KEY+1];
@@ -1685,7 +1688,7 @@ public:
   }
   /* ha_ methods: pubilc wrappers for private virtual API */
 
-  int ha_open(TABLE *table, const char *name, int mode, int test_if_locked);
+  int ha_open(TABLE *table, const char *name, int mode, uint test_if_locked);
   int ha_index_init(uint idx, bool sorted)
   {
     int result;
@@ -1809,7 +1812,7 @@ public:
   uint get_dup_key(int error);
   void reset_statistics()
   {
-    rows_read= rows_changed= 0;
+    rows_read= rows_changed= rows_tmp_read= 0;
     bzero(index_rows_read, sizeof(index_rows_read));
   }
   virtual void change_table_ptr(TABLE *table_arg, TABLE_SHARE *share)
@@ -1894,7 +1897,7 @@ public:
   */
   uint get_index(void) const
   { return inited == INDEX ? active_index : MAX_KEY; }
-  virtual int close(void)=0;
+  int ha_close(void);
 
   /**
     @retval  0   Bulk update used by handler
@@ -1970,10 +1973,18 @@ protected:
   virtual int index_last(uchar * buf)
    { return  HA_ERR_WRONG_COMMAND; }
   virtual int index_next_same(uchar *buf, const uchar *key, uint keylen);
+  virtual int close(void)=0;
+  inline void update_rows_read()
+  {
+    if (likely(!internal_tmp_table))
+      rows_read++;
+    else
+      rows_tmp_read++;
+  }
   inline void update_index_statistics()
   {
     index_rows_read[active_index]++;
-    rows_read++;
+    update_rows_read();
   }
 public:
 
@@ -2604,6 +2615,7 @@ public:
   virtual handlerton *partition_ht() const
   { return ht; }
   inline int ha_write_tmp_row(uchar *buf);
+  inline int ha_update_tmp_row(const uchar * old_data, uchar * new_data);
 };
 
 #include "multi_range_read.h"