MySQL Bugs: #94983: Assertion `w->frame_buffer()->s->db_type()->db

Bug #94983	Assertion `w->frame_buffer()->s->db_type()->db_type ... failed
Submitted:	11 Apr 2019 11:10	Modified:	26 May 11:07
Reporter:	Ramesh Sivaraman	Email Updates:
Status:	Closed	Impact on me:	None
Category:	MySQL Server: Optimizer	Severity:	S6 (Debug Builds)
Version:	8.0.15	OS:	Any
Assigned to:		CPU Architecture:	Any
Tags:	debug

Description:
Assertion `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' failed.

How to repeat:
# mysqld options required for replay:  --sql_mode=
CREATE DATABASE test;
USE test;
CREATE TABLE t1(a BINARY (130)) ROW_FORMAT=REDUNDANT;
INSERT INTO t1 VALUES(1),(2),(3),(4),(5);
INSERT INTO t1 SELECT * FROM t1;
insert into t1 values(_utf8 0xe880bd);
insert INTO t1 values('1');
create temporary table t1(a int)select * from t1;
SELECT a,COUNT(a)OVER w,MIN(a) OVER w FROM t1 WINDOW w AS (ORDER BY a DESC RANGE BETWEEN 1 PRECEDING AND CURRENT ROW);

Hello Ramesh,

Thank you for he report and test case.
Observed that 8.0.15 debug build is affected.

thanks,
Umesh

Internally this is closed as duplicate of BUG 29201831 and per closure report - 

Documented fix as follows in the MySQL 8.0.16 changelog:

    The position hint for the last row in a range frame was updated
    to be one row past the actual last row in the frame.

Closed.