From d762bf21cc0fa7a96b7135b4d5cf716d15a32fc8 Mon Sep 17 00:00:00 2001
From: Sergey Petrunya <psergey@askmonty.org>
Date: Tue, 1 Sep 2009 00:02:09 +0400
Subject: MWL#17: Table-elimination - Addressing review feedback, generation 4.

include/my_global.h:
  Make ALIGN_PTR's action correspond to that of ALIGN_SIZE
sql/item.cc:
  MWL#17: Table-elimination
  - Review feedback: function renames, better comments
sql/item.h:
  MWL#17: Table-elimination
  - Review feedback: function renames, better comments
sql/item_cmpfunc.cc:
  MWL#17: Table-elimination
  - Review feedback: function renames, better comments
sql/item_subselect.cc:
  MWL#17: Table-elimination
  - Review feedback: function renames, better comments
sql/item_subselect.h:
  MWL#17: Table-elimination
  - Review feedback: function renames, better comments
sql/opt_table_elimination.cc:
  MWL#17: Table-elimination
  - Addressing review feedback, generation 4: abstract everything in case
    we would need to change it for something else in the future.
sql/sql_list.h:
  MWL#17: Table-elimination
  - Introduce exchange_sort(List<T> ...) template function
sql/sql_select.cc:
  MWL#17: Table-elimination
  - Review feedback: function renames, better comments
---
 sql/sql_list.h | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

(limited to 'sql/sql_list.h')

diff --git a/sql/sql_list.h b/sql/sql_list.h
index 6edf9a00b87..eb580120c1b 100644
--- a/sql/sql_list.h
+++ b/sql/sql_list.h
@@ -442,6 +442,43 @@ public:
 };
 
 
+/*
+  Exchange sort algorithm for List<T>.
+*/
+template <class T> 
+inline void exchange_sort(List<T> *list_to_sort,
+                          int (*sort_func)(T *a, T *b, void *arg), void *arg)
+{
+  bool swap;
+  List_iterator<T> it(*list_to_sort);
+  do
+  {
+    T *item1= it++;
+    T **ref1= it.ref();
+    T *item2;
+
+    swap= FALSE;
+    while ((item2= it++))
+    {
+      T **ref2= it.ref();
+      if (sort_func(item1, item2, arg) < 0)
+      {
+        T *item= *ref1;
+        *ref1= *ref2;
+        *ref2= item;
+        swap= TRUE;
+      }
+      else
+      {
+        item1= item2;
+        ref1= ref2;
+      }
+    }
+    it.rewind();
+  } while (swap);
+}
+
+
 /*
   A simple intrusive list which automaticly removes element from list
   on delete (for THD element)
-- 
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