[MDEV-36208] dbug_print_table_row is broken: prints empty rows in debugger - Jira

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dbug_print_table_row() function was introduced to allow printing rows from debugger:

Example:

create table t1 (a int, b varchar(10));

insert into t1 values (1,'yksi'), (2,'kaksi');

Now in debugger:

b rr_sequential

Then run a query:

select * from t1;

in debugger:

  Thread 17 "mysqld" hit Breakpoint 1, rr_sequential (info=0x7fff180193d8) at

..../sql/records.cc:519

(gdb) next

(gdb) p dbug_print_table_row(info->table)

  $3 = 0x555557adcb20 <dbug_print_row_buff> "t1(a,b)=(1,yksi)"

This worked until this patch:

commit e1e1e50bbaf3fd96ac0b5ca4fcd28a458132e9bd

Author: Aleksey Midenkov <midenok@gmail.com>

Date:   Mon Jan 13 15:40:59 2025 +0300

    MDEV-35343 DML debug logging

After that, I get empty rows printed:

  $6 = 0x7fff180665c0 "t1()=()"

The columns are not printed because the above patch makes the print out function think no columns are in the read set.

is caused by

MDEV-35343 unexpected replace behaviour when long unique index on system versioned table

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