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Bug#35848: UUID() returns UUIDs with the wrong time

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offset for time part in UUIDs was 1/1000 of what it
should be. In other words, offset was off.

Also handle the case where we count into the future
when several UUIDs are generated in one "tick", and
then the next call is late enough for us to unwind
some but not all of those borrowed ticks.

Lastly, handle the case where we keep borrowing and
borrowing until the tick-counter overflows by also
changing into a new "numberspace" by creating a new
random suffix.
This commit is contained in:
Tatiana A. Nurnberg
2008-07-10 03:58:30 +02:00
parent a129837f66
commit 2d41201c8a
3 changed files with 86 additions and 12 deletions
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19
mysql-test/t/func_misc.test
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@@ -417,5 +417,24 @@ drop table t1;
#
SELECT NAME_CONST('var', 'value') COLLATE latin1_general_cs;
#
# Bug #35848: UUID() returns UUIDs with the wrong time
#
select @@session.time_zone into @save_tz;
# make sure all times are UTC so the DayNr won't differ
set @@session.time_zone='UTC';
select uuid() into @my_uuid;
# if version nibble isn't 1, the following calculations will be rubbish
select mid(@my_uuid,15,1);
select 24 * 60 * 60 * 1000 * 1000 * 10 into @my_uuid_one_day;
select concat('0',mid(@my_uuid,16,3),mid(@my_uuid,10,4),left(@my_uuid,8)) into @my_uuidate;
select floor(conv(@my_uuidate,16,10)/@my_uuid_one_day) into @my_uuid_date;
select 141427 + datediff(curdate(),'1970-01-01') into @my_uuid_synthetic;
# these should be identical; date part of UUID should be current date
select @my_uuid_date - @my_uuid_synthetic;
set @@session.time_zone=@save_tz;
--echo End of 5.0 tests