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MDEV-9895: Assertion `n_rows > 0' failed in Frame_cursor* get_frame_cursor

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n=0 in "ROWS 0 PRECEDING" is valid, add handling for it:
- Adjust the assert
- Bottom bound of 'ROW 0 PRECEDING' is actually looking at the current
  row, that is, it needs to process partition's first row directly in
  Frame_n_rows_preceding::next_partition().
- Added testcases
This commit is contained in:
Sergei Petrunia
2016-04-10 16:24:04 +02:00
parent 2905b2feb6
commit da7c5e3b85
3 changed files with 111 additions and 1 deletions
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10
sql/sql_window.cc
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@ -1279,6 +1279,14 @@ public:
- top bound should remove row (#n-3) from the window function.
*/
n_rows_to_skip= n_rows + (is_top_bound? 1:0) - 1;
/* Bottom bound "ROWS 0 PRECEDING" is a special case: */
if (n_rows_to_skip == -1)
{
cursor.get_next();
item->add();
n_rows_to_skip= 0;
}
}
void next_row(Item_sum* item)
@ -1496,7 +1504,7 @@ Frame_cursor *get_frame_cursor(Window_frame *frame, bool is_top_bound)
longlong n_rows= bound->offset->val_int();
/* These should be handled in the parser */
DBUG_ASSERT(!bound->offset->null_value);
DBUG_ASSERT(n_rows > 0);
DBUG_ASSERT(n_rows >= 0);
if (is_preceding)
return new Frame_n_rows_preceding(is_top_bound, n_rows);
else