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MDEV-11746: Wrong result upon using FIRST_VALUE with a window frame

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The same approach is needed for LAST_VALUE, otherwise the LAST_VALUE sum
functions are not cleared correctly. Now LAST_VALUE behaves as NTH_VALUE
with 0 offset, only that the frame that it is examining is the bottom bound,
not the top bound.
This commit is contained in:
Vicențiu Ciorbaru 2017-02-07 17:16:20 +02:00
parent 57341852b5
commit 5bf338435a
3 changed files with 33 additions and 18 deletions
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26
mysql-test/r/win_first_last_value.result
View file

@ -113,17 +113,19 @@ last_value(i) OVER (order by i rows between CURRENT ROW and 1 FOLLOWING) as last
first_value(i) OVER (order by i rows between 1 PRECEDING AND 1 FOLLOWING) as fst_1p1f,
last_value(i) OVER (order by i rows between 1 PRECEDING AND 1 FOLLOWING) as fst_1p1f,
first_value(i) OVER (order by i rows between 2 PRECEDING AND 1 PRECEDING) as fst_2p1p,
last_value(i) OVER (order by i rows between 2 PRECEDING AND 1 PRECEDING) as fst_2p1p
last_value(i) OVER (order by i rows between 2 PRECEDING AND 1 PRECEDING) as fst_2p1p,
first_value(i) OVER (order by i rows between 1 FOLLOWING AND 2 FOLLOWING) as fst_1f2f,
last_value(i) OVER (order by i rows between 1 FOLLOWING AND 2 FOLLOWING) as fst_1f2f
from t1;
i fst_1f last_1f fst_1p1f fst_1p1f fst_2p1p fst_2p1p
1 1 2 1 2 NULL NULL
2 2 3 1 3 1 1
3 3 4 2 4 1 2
4 4 5 3 5 2 3
5 5 6 4 6 3 4
6 6 7 5 7 4 5
7 7 8 6 8 5 6
8 8 9 7 9 6 7
9 9 10 8 10 7 8
10 10 10 9 10 8 9
i fst_1f last_1f fst_1p1f fst_1p1f fst_2p1p fst_2p1p fst_1f2f fst_1f2f
1 1 2 1 2 NULL NULL 2 3
2 2 3 1 3 1 1 3 4
3 3 4 2 4 1 2 4 5
4 4 5 3 5 2 3 5 6
5 5 6 4 6 3 4 6 7
6 6 7 5 7 4 5 7 8
7 7 8 6 8 5 6 8 9
8 8 9 7 9 6 7 9 10
9 9 10 8 10 7 8 10 10
10 10 10 9 10 8 9 NULL NULL
drop table t1;

4
mysql-test/t/win_first_last_value.test
View file

@ -69,7 +69,9 @@ select i,
first_value(i) OVER (order by i rows between 1 PRECEDING AND 1 FOLLOWING) as fst_1p1f,
last_value(i) OVER (order by i rows between 1 PRECEDING AND 1 FOLLOWING) as fst_1p1f,
first_value(i) OVER (order by i rows between 2 PRECEDING AND 1 PRECEDING) as fst_2p1p,
last_value(i) OVER (order by i rows between 2 PRECEDING AND 1 PRECEDING) as fst_2p1p
last_value(i) OVER (order by i rows between 2 PRECEDING AND 1 PRECEDING) as fst_2p1p,
first_value(i) OVER (order by i rows between 1 FOLLOWING AND 2 FOLLOWING) as fst_1f2f,
last_value(i) OVER (order by i rows between 1 FOLLOWING AND 2 FOLLOWING) as fst_1f2f
from t1;
drop table t1;

21
sql/sql_window.cc
View file

@ -2311,11 +2311,6 @@ void add_special_frame_cursors(THD *thd, Cursor_manager *cursor_manager,
fc->add_sum_func(item_sum);
cursor_manager->add_cursor(fc);
break;
case Item_sum::LAST_VALUE_FUNC:
fc= get_frame_cursor(thd, spec, false);
fc->add_sum_func(item_sum);
cursor_manager->add_cursor(fc);
break;
case Item_sum::LEAD_FUNC:
case Item_sum::LAG_FUNC:
{
@ -2355,6 +2350,22 @@ void add_special_frame_cursors(THD *thd, Cursor_manager *cursor_manager,
cursor_manager->add_cursor(fc);
break;
}
case Item_sum::LAST_VALUE_FUNC:
{
Frame_cursor *bottom_bound= get_frame_cursor(thd, spec, false);
Frame_cursor *top_bound= get_frame_cursor(thd, spec, true);
cursor_manager->add_cursor(bottom_bound);
cursor_manager->add_cursor(top_bound);
DBUG_ASSERT(item_sum->fixed);
Item *offset_item= new (thd->mem_root) Item_int(thd, 0);
offset_item->fix_fields(thd, &offset_item);
fc= new Frame_positional_cursor(*bottom_bound,
*top_bound, *bottom_bound,
*offset_item, false);
fc->add_sum_func(item_sum);
cursor_manager->add_cursor(fc);
break;
}
case Item_sum::NTH_VALUE_FUNC:
{
Frame_cursor *bottom_bound= get_frame_cursor(thd, spec, false);