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Code cleanup

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This commit is contained in:
Sergei Petrunia
2016-03-24 03:08:43 +03:00
parent 39d3cdbf22
commit c7a60de78c
4 changed files with 88 additions and 97 deletions
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10
sql/item_windowfunc.h
View File

@ -491,13 +491,13 @@ public:
: Item_func_or_sum(thd, (Item *) win_func),
window_name(win_name), window_spec(NULL),
force_return_blank(true),
read_value_from_result_field(false) {}
read_value_from_result_field(false) {}
Item_window_func(THD *thd, Item_sum *win_func, Window_spec *win_spec)
: Item_func_or_sum(thd, (Item *) win_func),
window_name(NULL), window_spec(win_spec),
force_return_blank(true),
read_value_from_result_field(false) {}
read_value_from_result_field(false) {}
Item_sum *window_func() { return (Item_sum *) args[0]; }
@ -545,6 +545,7 @@ public:
}
enum Item::Type type() const { return Item::WINDOW_FUNC_ITEM; }
private:
/*
Window functions are very special functions, so val_() methods have
special meaning for them:
@ -584,11 +585,6 @@ public:
read_value_from_result_field= true;
}
void set_read_value_from_result_field()
{
read_value_from_result_field= true;
}
double val_real()
{
double res;

2
sql/sql_select.cc
View File

@ -25898,7 +25898,7 @@ AGGR_OP::end_send()
// Update ref array
join_tab->join->set_items_ref_array(*join_tab->ref_array);
join->process_window_functions(&join->fields_list); // location #2
join->process_window_functions(&join->select_lex->window_funcs);
table->reginfo.lock_type= TL_UNLOCK;
bool in_first_read= true;

2
sql/sql_select.h
View File

@ -1494,7 +1494,7 @@ public:
int init_execution();
void exec();
bool process_window_functions(List<Item> *curr_fields_list);
bool process_window_functions(List<Item_window_func> *window_funcs);
void exec_inner();
bool prepare_result(List<Item> **columns_list);

163
sql/sql_window.cc
View File

@ -1579,102 +1579,97 @@ bool compute_two_pass_window_functions(Item_window_func *item_win,
true Error
*/
bool JOIN::process_window_functions(List<Item> *curr_fields_list)
bool JOIN::process_window_functions(List<Item_window_func> *window_funcs)
{
List_iterator_fast<Item> it(*curr_fields_list);
Item *item;
List_iterator_fast<Item_window_func> it(*window_funcs);
Item_window_func *item_win;
while ((item_win= it++))
{
while ((item= it++))
{
if (item->type() == Item::WINDOW_FUNC_ITEM)
{
Item_window_func *item_win = (Item_window_func *) item;
item_win->set_phase_to_computation();
Window_spec *spec = item_win->window_spec;
/*
The sorting criteria should be
(spec->partition_list, spec->order_list)
item_win->set_phase_to_computation();
Window_spec *spec = item_win->window_spec;
/*
The sorting criteria should be
(spec->partition_list, spec->order_list)
Connect the two lists for the duration of add_sorting_to_table()
call.
*/
DBUG_ASSERT(spec->partition_list->next[0] == NULL);
*(spec->partition_list->next)= spec->order_list->first;
Connect the two lists for the duration of add_sorting_to_table()
call.
*/
DBUG_ASSERT(spec->partition_list->next[0] == NULL);
*(spec->partition_list->next)= spec->order_list->first;
/*
join_tab[top_join_tab_count].table is the temp. table where join
output was stored.
*/
add_sorting_to_table(&join_tab[top_join_tab_count],
spec->partition_list->first);
join_tab[top_join_tab_count].used_for_window_func= true;
/*
join_tab[top_join_tab_count].table is the temp. table where join
output was stored.
*/
// CAUTION: The sorting criteria list is not yet connected
add_sorting_to_table(&join_tab[top_join_tab_count],
spec->partition_list->first);
join_tab[top_join_tab_count].used_for_window_func= true;
create_sort_index(this->thd, this, &join_tab[top_join_tab_count]);
/* Disconnect order_list from partition_list */
*(spec->partition_list->next)= NULL;
create_sort_index(this->thd, this, &join_tab[top_join_tab_count]);
/* Disconnect order_list from partition_list */
*(spec->partition_list->next)= NULL;
/*
Go through the sorted array and compute the window function
*/
READ_RECORD info;
TABLE *tbl= join_tab[top_join_tab_count].table;
if (init_read_record(&info, thd, tbl, select, 0, 1, FALSE))
return true;
bool is_error= false;
/*
Go through the sorted array and compute the window function
*/
READ_RECORD info;
TABLE *tbl= join_tab[top_join_tab_count].table;
if (init_read_record(&info, thd, tbl, select, 0, 1, FALSE))
return true;
bool is_error= false;
item_win->setup_partition_border_check(thd);
item_win->setup_partition_border_check(thd);
Item_sum::Sumfunctype type= item_win->window_func()->sum_func();
switch (type) {
case Item_sum::ROW_NUMBER_FUNC:
case Item_sum::RANK_FUNC:
case Item_sum::DENSE_RANK_FUNC:
{
/*
One-pass window function computation, walk through the rows and
assign values.
*/
if (compute_window_func_values(item_win, tbl, &info))
is_error= true;
break;
}
case Item_sum::PERCENT_RANK_FUNC:
case Item_sum::CUME_DIST_FUNC:
{
if (compute_two_pass_window_functions(item_win, tbl, &info))
is_error= true;
break;
}
case Item_sum::COUNT_FUNC:
case Item_sum::SUM_BIT_FUNC:
case Item_sum::SUM_FUNC:
case Item_sum::AVG_FUNC:
{
/*
Frame-aware window function computation. It does one pass, but
uses three cursors -frame_start, current_row, and frame_end.
*/
if (compute_window_func_with_frames(item_win, tbl, &info))
is_error= true;
break;
}
default:
DBUG_ASSERT(0);
Item_sum::Sumfunctype type= item_win->window_func()->sum_func();
switch (type) {
case Item_sum::ROW_NUMBER_FUNC:
case Item_sum::RANK_FUNC:
case Item_sum::DENSE_RANK_FUNC:
{
/*
One-pass window function computation, walk through the rows and
assign values.
*/
if (compute_window_func_values(item_win, tbl, &info))
is_error= true;
break;
}
item_win->set_phase_to_retrieval();
/* This calls filesort_free_buffers(): */
end_read_record(&info);
delete join_tab[top_join_tab_count].filesort;
join_tab[top_join_tab_count].filesort= NULL;
free_io_cache(tbl);
if (is_error)
return true;
case Item_sum::PERCENT_RANK_FUNC:
case Item_sum::CUME_DIST_FUNC:
{
if (compute_two_pass_window_functions(item_win, tbl, &info))
is_error= true;
break;
}
case Item_sum::COUNT_FUNC:
case Item_sum::SUM_BIT_FUNC:
case Item_sum::SUM_FUNC:
case Item_sum::AVG_FUNC:
{
/*
Frame-aware window function computation. It does one pass, but
uses three cursors -frame_start, current_row, and frame_end.
*/
if (compute_window_func_with_frames(item_win, tbl, &info))
is_error= true;
break;
}
default:
DBUG_ASSERT(0);
}
item_win->set_phase_to_retrieval();
/* This calls filesort_free_buffers(): */
end_read_record(&info);
delete join_tab[top_join_tab_count].filesort;
join_tab[top_join_tab_count].filesort= NULL;
free_io_cache(tbl);
if (is_error)
return true;
}
return false;
}