This is because of this in sql_yacc.yy: window_func_expr: window_func OVER_SYM window_name { $$= new (thd->mem_root) Item_window_func(thd, (Item_sum *) $1, $3); if ($$ == NULL) MYSQL_YYABORT; } | window_func OVER_SYM window_spec { LEX *lex= Lex; if (Select->add_window_spec(thd, lex->win_ref, Select->group_list, Select->order_list, lex->win_frame)) MYSQL_YYABORT; $$= new (thd->mem_root) Item_window_func(thd, (Item_sum *) $1, thd->lex->win_spec); if ($$ == NULL) MYSQL_YYABORT; if (Select->add_window_func((Item_window_func *) $$)) MYSQL_YYABORT; ^^^^^^^^^^^^^^^^^^^ note that add_window_func call is present in this branch but not in the other. } ; Should I fix this? On Thu, Mar 24, 2016 at 01:35:38AM +0300, Sergey Petrunia wrote:

Hello Igor,

I was trying to move JOIN::process_window_functions() from using join->fields_list to using join->select_lex->window_funcs.

And I discovered that join->select_lex->window_funcs does not contain window function items that use window definition. Is this intentional?

Example:

create table t0 (a int); insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); create table t1 (pk int, c int); insert into t1 select a+1,1 from t0; update t1 set c=2 where pk not in (1,2,3,4);

select pk, c, count(*) over (partition by c order by pk rows between 2 preceding and 2 following) as CNT from t1

Here:

#1 0x0000555555af5db6 in AGGR_OP::end_send (this=0x7fff4c0086c8) (gdb) p join->select_lex->window_funcs $69 = {<base_list> = {<Sql_alloc> = {<No data fields>}, first = 0x7fff4c005d18, last = 0x7fff4c005d18, elements = 1}, <No data fields>}

But:

select pk, c, count(*) over w1 as CNT from t1 window w1 as (partition by c order by pk rows between 2 preceding and 2 following);

(gdb) p join->select_lex->window_funcs $74 = {<base_list> = {<Sql_alloc> = {<No data fields>}, first = 0x555556d48820, last = 0x55555ab10b70, elements = 0}, <No data fields>}

BR Sergei -- Sergei Petrunia, Software Developer MariaDB Corporation | Skype: sergefp | Blog: http://s.petrunia.net/blog

-- BR Sergei -- Sergei Petrunia, Software Developer MariaDB Corporation | Skype: sergefp | Blog: http://s.petrunia.net/blog