HHH-19228 upgrade mysql testing version to 9.2

[MoadElfatihi]

The changes is about upgrading mysal testing version to 9.2

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https://hibernate.atlassian.net/browse/HHH-19228

[beikov]

Are you going to look into the failure? It seems MySQL is starting very slowly.

[beikov]

Removing the nulls clause from tests is not an acceptable change for a database upgrade. Can you elaborate why you had to do that?

[MoadElfatihi]

Removing the nulls clause from tests is not an acceptable change for a database upgrade. Can you elaborate why you had to do that?

Comment update

@beikov I think I did not explain well my answer.
There is a bug in mysql that I had raised to the MySql team [(https://bugs.mysql.com/bug.php?id=117765&thanks=2&notify=195)] and that they confirmed to me.
Note : there is no issue in Hibernate .

Explanation :

The 2 tests are failing instead of returning 5,13,7,6,5 we had from the Mysql 5,6,7,13,5
If I did not modify the test , for example OrderedSetAggregateTest.java , the sql query generated is :
select group_concat(eob1_0.the_string order by case when (eob1_0.id) is null then 0 else 1 end, eob1_0.id desc separator ',') from EntityOfBasics eob1_0

But In some infected version in mySql it is transformed incorrectly (using explain....) :
select group_concat(hibernate_orm_test.Entity_Of_Basics.theString order by **hibernate_orm_test.Entity_Of_Basics.identifier ASC**,hibernate_orm_test.Entity_Of_Basics.identifierDESC separator ',') ASgroup_concat(theString
order by
case when (identifier) is null then 0
else 1 end,
identifier desc separator ','
fromhibernate_orm_test.Entity_Of_Basics``

Look at the text in Bold hibernate_orm_test.Entity_Of_Basics.identifier` ASC . So in this is the bug.

I agree with you, updating a test while upgrading mySQl Version seems not to be logical, but this is the cause , there is a bug in MySql ( I spend the week trying to switch off every option in the optimizer but in vain).

I got the courage to change it , why ?
select listagg(eob.theString, ',') within group (order by eob.id desc nulls : ids are primary keys and are never null, so I get ride of it to avoid confusing SGBD . I tried with 9.1 and same , you can take please a look at the bug that I raised.