doctrine/orm v2.5.7 on GitHub

This release fixes a number of bugs detected in the current stable
release of the ORM.

This patch introduces compatibility with Doctrine DBAL 2.6.x. #6580

The most critical issue being fixed is a bug
in Doctrine\ORM\PersistentCollection, causing duplicate data
to be persisted when a collection is both marked as initialized
and dirty, and more entries are added to it via
the Doctrine\Common\Collections\Collection#add()
API. #6613 #6614
#6616

The return value of Doctrine\ORM\PersistentCollection#removeElement()
was sometimes an object or null, causing some applications to crash when PHP is run within the context of declare(strict_types=1);` #6550

Memory leak issues with the hydrator process were fixed: the
hydrator object was never being garbage collected due to it
being registered with a Doctrine\Common\EventManager instance
to listen for the Doctrine\ORM\Events::onClear event. #1515

The Doctrine\ORM\Tools\Pagination\CountOutputWalker was producing
invalid SQL for queries containing a GROUP BY clause. #6243

The SQL generated for a DQL query containing a JTI (Joined Table
Inheritance) selection and a WITH clause applied to a JOIN
condition was invalid on PostgreSQL. #6475

The Doctrine\ORM\Tools\Console\MetadataFilter was not detecting
all metadata matching the filter regular expression. #5715

The Doctrine\ORM\Tools\SchemaTool was raising notices due to
invalid lookup for a discriminator column length, which may
not be defined in all mappings. #5798

Total issues resolved: 18