Window functions: Better class names

As discussed on the call:
- s/Window_funcs_computation_step/Window_funcs_computation/g
- s/Window_func_sort/Window_funcs_sort/g

sql/sql_explain.h

@@ -311,7 +311,7 @@ class Explain_aggr_window_funcs : public Explain_aggr_node
   enum_explain_aggr_node_type get_type() { return AGGR_OP_WINDOW_FUNCS; }
 
   void print_json_members(Json_writer *writer, bool is_analyze);
-  friend class Window_funcs_computation_step;
+  friend class Window_funcs_computation;
 };
 
 /////////////////////////////////////////////////////////////////////////////

sql/sql_select.cc

@@ -2661,7 +2661,7 @@ bool JOIN::make_aggr_tables_info()
   curr_tab= join_tab + top_join_tab_count + aggr_tables - 1;
   if (select_lex->window_funcs.elements)
   {
-    curr_tab->window_funcs_step= new Window_funcs_computation_step;
+    curr_tab->window_funcs_step= new Window_funcs_computation;
     if (curr_tab->window_funcs_step->setup(thd, &select_lex->window_funcs,
                                            curr_tab))
       DBUG_RETURN(true);

sql/sql_select.h

@@ -428,7 +428,7 @@ typedef struct st_join_table {
     Non-NULL value means this join_tab must do window function computation
     before reading.
   */
-  Window_funcs_computation_step* window_funcs_step;
+  Window_funcs_computation* window_funcs_step;
 
   /**
     List of topmost expressions in the select list. The *next* JOIN TAB

sql/sql_window.cc

@@ -1798,7 +1798,7 @@ bool Window_func_runner::exec(TABLE *tbl, SORT_INFO *filesort_result)
 }
 
 
-bool Window_func_sort::exec(JOIN *join)
+bool Window_funcs_sort::exec(JOIN *join)
 {
   THD *thd= join->thd;
   JOIN_TAB *join_tab= &join->join_tab[join->top_join_tab_count];
@@ -1825,7 +1825,7 @@ bool Window_func_sort::exec(JOIN *join)
 }
 
 
-bool Window_func_sort::setup(THD *thd, SQL_SELECT *sel, 
+bool Window_funcs_sort::setup(THD *thd, SQL_SELECT *sel, 
                              List_iterator<Item_window_func> &it)
 {
   Item_window_func *win_func= it.peek();
@@ -1854,7 +1854,7 @@ bool Window_func_sort::setup(THD *thd, SQL_SELECT *sel,
 }
 
 
-bool Window_funcs_computation_step::setup(THD *thd,
+bool Window_funcs_computation::setup(THD *thd,
                                           List<Item_window_func> *window_funcs,
                                           JOIN_TAB *tab)
 {
@@ -1867,11 +1867,11 @@ bool Window_funcs_computation_step::setup(THD *thd,
     DBUG_ASSERT(!sel->quick);
   }
 
-  Window_func_sort *srt;
+  Window_funcs_sort *srt;
   List_iterator<Item_window_func> iter(*window_funcs);
   while (iter.peek())
   {
-    if (!(srt= new Window_func_sort()) ||
+    if (!(srt= new Window_funcs_sort()) ||
         srt->setup(thd, sel, iter))
     {
       return true;
@@ -1882,10 +1882,10 @@ bool Window_funcs_computation_step::setup(THD *thd,
 }
 
 
-bool Window_funcs_computation_step::exec(JOIN *join)
+bool Window_funcs_computation::exec(JOIN *join)
 {
-  List_iterator<Window_func_sort> it(win_func_sorts);
-  Window_func_sort *srt;
+  List_iterator<Window_funcs_sort> it(win_func_sorts);
+  Window_funcs_sort *srt;
   /* Execute each sort */
   while ((srt = it++))
   {
@@ -1896,10 +1896,10 @@ bool Window_funcs_computation_step::exec(JOIN *join)
 }
 
 
-void Window_funcs_computation_step::cleanup()
+void Window_funcs_computation::cleanup()
 {
-  List_iterator<Window_func_sort> it(win_func_sorts);
-  Window_func_sort *srt;
+  List_iterator<Window_funcs_sort> it(win_func_sorts);
+  Window_funcs_sort *srt;
   while ((srt = it++))
   {
     srt->cleanup();
@@ -1909,12 +1909,12 @@ void Window_funcs_computation_step::cleanup()
 
 
 Explain_aggr_window_funcs*
-Window_funcs_computation_step::save_explain_plan(MEM_ROOT *mem_root, 
+Window_funcs_computation::save_explain_plan(MEM_ROOT *mem_root, 
                                                  bool is_analyze)
 {
   Explain_aggr_window_funcs *xpl= new Explain_aggr_window_funcs;
-  List_iterator<Window_func_sort> it(win_func_sorts);
-  Window_func_sort *srt;
+  List_iterator<Window_funcs_sort> it(win_func_sorts);
+  Window_funcs_sort *srt;
   while ((srt = it++))
   {
     Explain_aggr_filesort *eaf=

sql/sql_window.h

@@ -189,7 +189,7 @@ class Window_func_runner : public Sql_alloc
 
 */
 
-class Window_func_sort : public Sql_alloc
+class Window_funcs_sort : public Sql_alloc
 {
   List<Window_func_runner> runners;
 
@@ -200,7 +200,7 @@ class Window_func_sort : public Sql_alloc
   bool exec(JOIN *join);
   void cleanup() { delete filesort; }
 
-  friend class Window_funcs_computation_step;
+  friend class Window_funcs_computation;
 };
 
 
@@ -215,9 +215,9 @@ class Explain_aggr_window_funcs;
     temporary table.
 */
 
-class Window_funcs_computation_step : public Sql_alloc
+class Window_funcs_computation : public Sql_alloc
 {
-  List<Window_func_sort> win_func_sorts;
+  List<Window_funcs_sort> win_func_sorts;
 public:
   bool setup(THD *thd, List<Item_window_func> *window_funcs, st_join_table *tab);
   bool exec(JOIN *join);