How can I include a PARTITION selection in the FROM clause using Doctrine QueryBuilder?

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You can include a PARTITION selection in the FROM clause using Doctrine QueryBuilder by using the following code sample:

$qb = $entityManager->createQueryBuilder();

$qb->select('p')
   ->from('AppBundle:Product', 'p', 'p.id', 'PARTITION(p.id, 100)');

In this example, we are selecting a Product entity and partitioning it based on its ID field to select only those records that belong to the specified partition. The from() method takes four arguments: the entity class (AppBundle:Product), the alias (p), the index by which to partition (p.id), and the partition function (PARTITION(p.id, 100)).

The partition function is a MySQL-specific function that partitions a table or an index by a given expression. The first argument of the partition function is the column or expression that is used to determine the partition, and the second argument specifies the number of partitions to create.

Note that this example assumes that the partitioned table already exists, and that the partition function is already defined for that table.