[hibernate-dev] MySQL versus MariaDB

[Sanne Grinovero]

Looks like we'll want to have both MariaDB and MySQL on ci.hibernate.org then:
 - https://hibernate.atlassian.net/browse/WEBSITE-383

On 22 July 2015 at 22:51, Steve Ebersole <steve at hibernate.org> wrote:
> https://hibernate.atlassian.net/browse/HHH-9969
>
> On Wed, Jul 22, 2015 at 2:18 PM Steve Ebersole <steve at hibernate.org> wrote:
>
>> As I have developed the matrix tests against MariaDB I have had in the
>> back of my head whether we might want to develop a Dialect for MariaDB.  As
>> I understand it, MariaDB does strive to remain compatible with MySQL but it
>> does offer some enhancements.  And it might have some minor deviations.
>> Today I think I found one such deviation, in their respective support for
>> casting decimal/floating-point values.  I came across this because of some
>> failed tests.
>>
>> There are quite a few resolved issues in Jira wrt MySQL and casting.  So I
>> have to assume these tests work on MySQL which tells me there is a
>> deviation in their behavior...
>>
>> The tests in question (more or less) do: "select ... cast( x as
>> big_decimal ) ...".  We understand big_decimal as java.sql.Types#NUMERIC
>> for which the MySQL Dialect says to use "decimal" for casting purposes.
>>
>> On MariaDB at least "decimal" (no precision) leads to a data trunction.
>> We are expecting a value like "12.399999618530273" but get back "12.0".
>> Because for MariaDB DECIMAL is equivalent to DECIMAL(10,0).
>>
>> So as it is, for this minor case at least the MySQL dialects work against
>> MySQL databases (we assume) but fail against MariaDB databases.
>>
>> The other difficulty with a dialect specific for MariaDB is
>> auto-detection.  The MariaDB JDBC drivers report the underlying database as
>> mysql.
>>
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