Changes made according to the review given, mostly fixing coding style errors

mysql-test/r/win_percentile_cont.result

@@ -1,111 +0,0 @@
-CREATE TABLE student (name CHAR(10), test double, score DECIMAL(19,4));
-INSERT INTO student VALUES
-('Chun', 0, 3), ('Chun', 0, 7),
-('Kaolin', 0.5, 3), ('Kaolin', 0.6, 7),
-('Kaolin', 0.5, 4),
-('Tatiana', 0.8, 4), ('Tata', 0.8, 4);
-select name, percentile_disc(0.5) within group(order by score)  over ()  from student;
-name	percentile_disc(0.5) within group(order by score)  over ()
-Chun	4.0000000000
-Chun	4.0000000000
-Kaolin	4.0000000000
-Kaolin	4.0000000000
-Kaolin	4.0000000000
-Tatiana	4.0000000000
-Tata	4.0000000000
-select name, percentile_cont(0.5) within group(order by score)  over ()  from student;
-name	percentile_cont(0.5) within group(order by score)  over ()
-Chun	4.0000000000
-Chun	4.0000000000
-Kaolin	4.0000000000
-Kaolin	4.0000000000
-Kaolin	4.0000000000
-Tatiana	4.0000000000
-Tata	4.0000000000
-select name, percentile_cont(null)  within group(order by score) over (partition by name) from student;
-name	percentile_cont(null)  within group(order by score) over (partition by name)
-Chun	NULL
-Chun	NULL
-Kaolin	NULL
-Kaolin	NULL
-Kaolin	NULL
-Tatiana	NULL
-Tata	NULL
-select name, percentile_disc(null)  within group(order by score) over (partition by name) from student;
-name	percentile_disc(null)  within group(order by score) over (partition by name)
-Chun	NULL
-Chun	NULL
-Kaolin	NULL
-Kaolin	NULL
-Kaolin	NULL
-Tatiana	NULL
-Tata	NULL
-select name, percentile_cont(0.5)  within group(order by score) over (partition by name) as c from student;
-name	c
-Chun	5.0000000000
-Chun	5.0000000000
-Kaolin	4.0000000000
-Kaolin	4.0000000000
-Kaolin	4.0000000000
-Tatiana	4.0000000000
-Tata	4.0000000000
-select name, percentile_disc(0.5)  within group(order by score) over (partition by name) as c from student;
-name	c
-Chun	3.0000000000
-Chun	3.0000000000
-Kaolin	4.0000000000
-Kaolin	4.0000000000
-Kaolin	4.0000000000
-Tatiana	4.0000000000
-Tata	4.0000000000
-select * from ( select name , percentile_cont(0.5) within group ( order by score) over (partition by name ) from student ) as t;
-name	percentile_cont(0.5) within group ( order by score) over (partition by name )
-Chun	5.0000000000
-Chun	5.0000000000
-Kaolin	4.0000000000
-Kaolin	4.0000000000
-Kaolin	4.0000000000
-Tatiana	4.0000000000
-Tata	4.0000000000
-select * from ( select name , percentile_disc(0.5) within group ( order by score) over (partition by name ) from student ) as t;
-name	percentile_disc(0.5) within group ( order by score) over (partition by name )
-Chun	3.0000000000
-Chun	3.0000000000
-Kaolin	4.0000000000
-Kaolin	4.0000000000
-Kaolin	4.0000000000
-Tatiana	4.0000000000
-Tata	4.0000000000
-select name from student a where (select  percentile_disc(0.5) within group (order by score) over (partition by name) from student b limit 1) >= 0.5;
-name
-Chun
-Chun
-Kaolin
-Kaolin
-Kaolin
-Tatiana
-Tata
-select score,  percentile_cont(0.5)  within group(order by name) over (partition by score) from student;
-ERROR HY000: Numeric datatype is required for Percentile_CONT function
-select score,  percentile_disc(0.5)  within group(order by name) over (partition by score) from student;
-score	percentile_disc(0.5)  within group(order by name) over (partition by score)
-3.0000	Chun
-7.0000	Chun
-3.0000	Chun
-7.0000	Chun
-4.0000	Tata
-4.0000	Tata
-4.0000	Tata
-select percentile_disc(0.5) within group(order by score,test) over (partition by name) from student;
-ERROR HY000: Incorrect number of elements in the order list for 'percentile_disc'
-select percentile_cont(0.5) within group(order by score,test) over (partition by name) from student;
-ERROR HY000: Incorrect number of elements in the order list for 'percentile_cont'
-select percentile_disc(1.5) within group(order by score) over (partition by name) from student;
-ERROR HY000: Argument to the percentile functions does not belong to the range [0,1]
-select percentile_cont(1.5) within group(order by score) over (partition by name) from student;
-ERROR HY000: Argument to the percentile functions does not belong to the range [0,1]
-select name,percentile_cont(test) within group(order by score) over (partition by name) from student;
-ERROR HY000: Argument to the percentile functions is not a constant
-select name, percentile_disc(test) within group(order by score) over (partition by name) from student;
-ERROR HY000: Argument to the percentile functions is not a constant
-drop table student;

mysql-test/t/win_percentile_cont.test

@@ -1,55 +0,0 @@
-CREATE TABLE student (name CHAR(10), test double, score DECIMAL(19,4));
-INSERT INTO student VALUES
-('Chun', 0, 3), ('Chun', 0, 7),
-('Kaolin', 0.5, 3), ('Kaolin', 0.6, 7),
-('Kaolin', 0.5, 4),
-('Tatiana', 0.8, 4), ('Tata', 0.8, 4);
-
-#no partition clause
-select name, percentile_disc(0.5) within group(order by score)  over ()  from student;
-select name, percentile_cont(0.5) within group(order by score)  over ()  from student;
-
-# argument set to null
-select name, percentile_cont(null)  within group(order by score) over (partition by name) from student;
-select name, percentile_disc(null)  within group(order by score) over (partition by name) from student;
-
-# complete query with partition column
-select name, percentile_cont(0.5)  within group(order by score) over (partition by name) as c from student;
-select name, percentile_disc(0.5)  within group(order by score) over (partition by name) as c from student;
-
-#subqueries having percentile functions
-
-select * from ( select name , percentile_cont(0.5) within group ( order by score) over (partition by name ) from student ) as t;
-select * from ( select name , percentile_disc(0.5) within group ( order by score) over (partition by name ) from student ) as t;
-select name from student a where (select  percentile_disc(0.5) within group (order by score) over (partition by name) from student b limit 1) >= 0.5;
-
-# WITH STORED PROCEDURES
-
-
-#DISALLOWED FIELDS IN ORDER BY CLAUSE
---error ER_WRONG_TYPE_FOR_PERCENTILE_CONT
-select score,  percentile_cont(0.5)  within group(order by name) over (partition by score) from student;
-select score,  percentile_disc(0.5)  within group(order by name) over (partition by score) from student;
-
-# error with 2 order by elements
-
---error ER_NOT_SINGLE_ELEMENT_ORDER_LIST
-select percentile_disc(0.5) within group(order by score,test) over (partition by name) from student;
---error ER_NOT_SINGLE_ELEMENT_ORDER_LIST
-select percentile_cont(0.5) within group(order by score,test) over (partition by name) from student;
-
-#parameter value should be in the range of 0 to 1( NEED TO THINK A WAY FOR THIS)
---error ER_ARGUMENT_OUT_OF_RANGE
-select percentile_disc(1.5) within group(order by score) over (partition by name) from student;
---error ER_ARGUMENT_OUT_OF_RANGE
-select percentile_cont(1.5) within group(order by score) over (partition by name) from student;
-
---error ER_ARGUMENT_NOT_CONSTANT
-select name,percentile_cont(test) within group(order by score) over (partition by name) from student;
---error ER_ARGUMENT_NOT_CONSTANT
-select name, percentile_disc(test) within group(order by score) over (partition by name) from student;
-
-#CHECK TYPE OF THE ARGUMENT, SHOULD BE ONLY NUMERICAL
-#select name, percentile_cont(name) within group(order by score) over (partition by name) from student;
-
-drop table student;

sql/item.h

@@ -5341,7 +5341,6 @@ public:
   Cached_item_real(Item *item_par) :Cached_item_item(item_par),value(0.0) {}
   bool cmp(void);
   int  cmp_read_only();
-  double get_value(){ return value;}
 };
 
 class Cached_item_int :public Cached_item_item
@@ -5351,7 +5350,6 @@ public:
   Cached_item_int(Item *item_par) :Cached_item_item(item_par),value(0) {}
   bool cmp(void);
   int  cmp_read_only();
-  longlong get_value(){ return value;}
 };
 
 
@@ -5362,7 +5360,6 @@ public:
   Cached_item_decimal(Item *item_par);
   bool cmp(void);
   int  cmp_read_only();
-  my_decimal *get_value(){ return &value;};
 };
 
 class Cached_item_field :public Cached_item

sql/item_windowfunc.h

@@ -757,14 +757,14 @@ public:
 
   bool add()
   {
-    Item *arg = get_arg(0);
+    Item *arg= get_arg(0);
     if (arg->is_null())
       return false;
 
     if (first_call)
     {
       prev_value= arg->val_real();
-      if (prev_value >1 || prev_value < 0)
+      if (prev_value > 1 || prev_value < 0)
       {
         my_error(ER_ARGUMENT_OUT_OF_RANGE, MYF(0));
         return true;
@@ -821,7 +821,7 @@ public:
 
   void fix_length_and_dec()
   {
-    decimals = 10;  // TODO-cvicentiu find out how many decimals the standard
+    decimals = 5;  // TODO-cvicentiu find out how many decimals the standard
                     // requires.
   }
 
@@ -829,6 +829,7 @@ public:
   { return get_item_copy<Item_sum_percentile_disc>(thd, mem_root, this); }
   void setup_window_func(THD *thd, Window_spec *window_spec);
   void setup_hybrid(THD *thd, Item *item);
+  bool fix_fields(THD *thd, Item **ref);
 
 private:
   Item_cache *value;
@@ -876,7 +877,7 @@ public:
 
   bool add()
   {
-    Item *arg = get_arg(0);
+    Item *arg= get_arg(0);
     if (arg->is_null())
       return false;
 
@@ -884,7 +885,7 @@ public:
     {
       first_call= false;
       prev_value= arg->val_real();
-      if (prev_value >1 || prev_value < 0)
+      if (prev_value > 1 || prev_value < 0)
       {
         my_error(ER_ARGUMENT_OUT_OF_RANGE, MYF(0));
         return true;
@@ -950,7 +951,7 @@ public:
 
   void fix_length_and_dec()
   {
-    decimals = 10;  // TODO-cvicentiu find out how many decimals the standard
+    decimals = 5;  // TODO-cvicentiu find out how many decimals the standard
                     // requires.
   }
 
@@ -958,6 +959,7 @@ public:
   { return get_item_copy<Item_sum_percentile_cont>(thd, mem_root, this); }
   void setup_window_func(THD *thd, Window_spec *window_spec);
   void setup_hybrid(THD *thd, Item *item);
+  bool fix_fields(THD *thd, Item **ref);
 
 private:
   Item_cache *floor_value;

sql/sql_window.cc

@@ -1743,7 +1743,17 @@ public:
     /* Walk to the end of the partition, find how many rows there are. */
     while (!cursor.next())
       num_rows_in_partition++;
+    set_win_funcs_row_count(num_rows_in_partition);
+  }
 
+  ha_rows get_curr_rownum() const
+  {
+    return cursor.get_rownum();
+  }
+
+protected:
+  void set_win_funcs_row_count(ha_rows num_rows_in_partition)
+  {
     List_iterator_fast<Item_sum> it(sum_functions);
     Item_sum* item;
     while ((item= it++))
@@ -1753,20 +1763,16 @@ public:
       item_with_row_count->set_row_count(num_rows_in_partition);
     }
   }
-
-  ha_rows get_curr_rownum() const
-  {
-    return cursor.get_rownum();
-  }
 };
 
-class Frame_unbounded_following_set_count_special: public Frame_unbounded_following_set_count
+class Frame_unbounded_following_set_count_no_nulls: 
+            public Frame_unbounded_following_set_count
 {
 
 public:
-  Frame_unbounded_following_set_count_special(THD *thd,
+  Frame_unbounded_following_set_count_no_nulls(THD *thd,
       SQL_I_List<ORDER> *partition_list,
-      SQL_I_List<ORDER> *order_list, Item* arg) :
+      SQL_I_List<ORDER> *order_list) :
   Frame_unbounded_following_set_count(thd,partition_list, order_list)
   {
     order_item= order_list->first->item[0];
@@ -1782,16 +1788,9 @@ public:
     {
       if (!order_item->is_null())
         num_rows_in_partition++;
-    }while (!cursor.next());
+    } while (!cursor.next());
 
-    List_iterator_fast<Item_sum> it(sum_functions);
+    set_win_funcs_row_count(num_rows_in_partition);
-    Item_sum* item;
-    while ((item= it++))
-    {
-      Item_sum_window_with_row_count* item_with_row_count =
-        static_cast<Item_sum_window_with_row_count *>(item);
-      item_with_row_count->set_row_count(num_rows_in_partition);
-    }
   }
 
   ha_rows get_curr_rownum() const
@@ -2614,9 +2613,9 @@ void get_window_functions_required_cursors(
     {
       if (item_win_func->only_single_element_order_list())
       {
-        fc= new Frame_unbounded_following_set_count_special(thd,
+        fc= new Frame_unbounded_following_set_count_no_nulls(thd,
                 item_win_func->window_spec->partition_list,
-                item_win_func->window_spec->order_list, item_win_func->window_func()->get_arg(0));
+                item_win_func->window_spec->order_list);
       }
       else
       {