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Make window function computation a part of the query plan

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Added class Window_funcs_computation, with setup() method to setup
execution, and exec() to run window function computation.

setup() is currently trivial. In the future, it is expected to optimize
the number of sorting operations and passes that are done over the temp.
table.
This commit is contained in:
Sergei Petrunia
2016-03-27 11:47:19 +03:00
parent 6ad9ac212c
commit 0786b0d2cd
4 changed files with 279 additions and 119 deletions
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28
sql/sql_select.cc
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@ -233,7 +233,7 @@ static bool list_contains_unique_index(TABLE *table,
bool (*find_func) (Field *, void *), void *data);
static bool find_field_in_item_list (Field *field, void *data);
static bool find_field_in_order_list (Field *field, void *data);
int create_sort_index(THD *thd, JOIN *join, JOIN_TAB *tab);
int create_sort_index(THD *thd, JOIN *join, JOIN_TAB *tab, Filesort *fsort);
static int remove_dup_with_compare(THD *thd, TABLE *entry, Field **field,
Item *having);
static int remove_dup_with_hash_index(THD *thd,TABLE *table,
@ -2706,6 +2706,14 @@ JOIN::create_postjoin_aggr_table(JOIN_TAB *tab, List<Item> *table_fields,
tab->table= table;
table->reginfo.join_tab= tab;
// psergey-todo: this is probably an incorrect place:
if (select_lex->window_funcs.elements)
{
tab->window_funcs= new Window_funcs_computation;
if (tab->window_funcs->setup(thd, &select_lex->window_funcs))
goto err;
}
/* if group or order on first table, sort first */
if (group_list && simple_group)
{
@ -19189,7 +19197,7 @@ JOIN_TAB::sort_table()
DBUG_ASSERT(join->ordered_index_usage != (filesort->order == join->order ?
JOIN::ordered_index_order_by :
JOIN::ordered_index_group_by));
rc= create_sort_index(join->thd, join, this);
rc= create_sort_index(join->thd, join, this, NULL);
return (rc != 0);
}
@ -21160,8 +21168,8 @@ use_filesort:
thd Thread handler
join Join with table to sort
join_tab What table to sort
fsort Filesort object. NULL means "use tab->filesort".
IMPLEMENTATION
- If there is an index that can be used, the first non-const join_tab in
'join' is modified to use this index.
@ -21177,17 +21185,19 @@ use_filesort:
*/
int
create_sort_index(THD *thd, JOIN *join, JOIN_TAB *tab)
create_sort_index(THD *thd, JOIN *join, JOIN_TAB *tab, Filesort *fsort)
{
ha_rows examined_rows;
ha_rows found_rows;
ha_rows filesort_retval= HA_POS_ERROR;
TABLE *table;
SQL_SELECT *select;
Filesort *fsort= tab->filesort;
bool quick_created= FALSE;
DBUG_ENTER("create_sort_index");
if (fsort == NULL)
fsort= tab->filesort;
// One row, no need to sort. make_tmp_tables_info should already handle this.
DBUG_ASSERT(!join->only_const_tables() && fsort);
table= tab->table;
@ -25898,7 +25908,11 @@ AGGR_OP::end_send()
// Update ref array
join_tab->join->set_items_ref_array(*join_tab->ref_array);
join->process_window_functions(&join->select_lex->window_funcs);
if (join_tab->window_funcs)
{
join_tab->window_funcs->exec(join);
}
table->reginfo.lock_type= TL_UNLOCK;
bool in_first_read= true;