Bug #111562 nth_value window function assertion error
Submitted: 26 Jun 2023 11:15 Modified: 14 Nov 2023 22:40
Reporter: Pedro Ferreira Email Updates:
Status: Closed Impact on me:
None 
Category:MySQL Server: DML Severity:S6 (Debug Builds)
Version:8.0.33 OS:Ubuntu (22.04)
Assigned to: CPU Architecture:x86 (x86_64)
Tags: nth_value

[26 Jun 2023 11:15] Pedro Ferreira 
Description:
Run the following queries:

CREATE TABLE t0 (c1 TINYINT UNSIGNED, c5 BIT);
INSERT INTO `t0` VALUES (255,NULL),(255,NULL),(0,NULL),(0,NULL),(0,NULL),(0,NULL),(0,NULL),(12,_binary '\0'),(206,_binary '\0'),(135,_binary '\0'),(193,_binary '\0'),(244,_binary '\0');
SELECT nth_value(t0.c1, 97) OVER (ORDER BY t0.c1 RANGE BETWEEN 99 FOLLOWING AND 51 FOLLOWING) FROM t0;

The SELECT will trigger an assertion error at sql/iterators/window_iterators.cc:329
assert(w->frame_buffer()->s->db_type()->db_type == DB_TYPE_INNODB || cnt <= 1 || (w->last_row_output() == 0 && w->frame()->m_from->m_border_type == WBT_VALUE_FOLLOWING) || for_nth_value);

The compilation parameters are the same as issue 108148:

-DWITH_DEBUG=1 -DWITH_ASAN=ON -DWITH_UBSAN=ON and boost library version 1.77

How to repeat:
Run the queries above.
[26 Jun 2023 11:21] MySQL Verification Team 
Hello Pedro Ferreira,

Thank you for the report and feedback.
Observed that 8.0.33 debug build is affected.

regards,
Umesh
[14 Nov 2023 22:40] Christine Cole 
Posted by developer:
 
Fixed as of the upcoming MySQL 8.3.0 release, and here's the proposed changelog entry from the documentation team:

In debug builds, using the NTH_ VALUE() window function with an empty
logical range produced an assertion error.

Thank you for the bug report.
[17 Jan 2024 18:25] Jean-François Gagné 
This is flagged as fixed in 8.3.0, but also as affecting 8.0.33.

Will this be fixed in a future 8.0 release (I tested on 8.0.36 debug build and it crashes).