[ker0x]

Q	A
Bug fix?	yes
New feature?	no
Deprecations?	no
Documentation?	no
Issues	Fix #4191
License	MIT

DoctrineOrmAdapter::count() replaces the SELECT with COUNT(alias) and removes the ORDER BY, but it keeps every bound parameter. When a parameter is only used by the removed parts, for example a scalar subquery or a HIDDEN sort key added with addSelect(), or a CASE expression in orderBy(), the count query no longer uses it and Doctrine rejects it:

$queryBuilder
    ->select('a')
    ->addSelect('(SELECT COUNT(b.id) FROM App\Entity\Book b WHERE b.author = a AND b.price > :minPrice) AS expensiveBooks')
    ->from(Author::class, 'a')
    ->setParameter('minPrice', 10);

$pagination->getItems();      // works
$pagination->getTotalItems(); // QueryException: Too many parameters: the query defines 0 parameters and you bound 1

The count query now keeps only the parameters that its DQL still uses. It does this the same way as Doctrine's own Paginator (unbindUnusedQueryParams()): it parses the query and reads the parameter mappings. Parameters used by the WHERE clause, including ones shared with the SELECT, stay bound. The query is parsed only when it has parameters.

Count query	Before	After
Parameter only used by a subquery in the SELECT	QueryException	Total
Parameter only used by the ORDER BY	QueryException	Total
Parameter used by the WHERE clause	Total	Total

The DBAL adapter is not affected: it wraps the whole query in a subquery, so every parameter stays in use.

Checks:

• The three new tests (named parameter in the SELECT, parameter in the ORDER BY, positional parameters) fail on 3.x with the Too many parameters error, and pass with the fix.
• Also probed: a parameter shared by the SELECT and the WHERE clause, and a collection join (COUNT(DISTINCT)) with a SELECT-only parameter.
• The full Pagination suite passes, except UXPaginationExtensionTest::testNamedPaginatorsInheritRootConfigurationAndOverrideSelectedValues, which fails the same way on 3.x with symfony/dependency-injection 8.2.x-dev.
• The adapter tests pass with --prefer-lowest (doctrine/orm 3.0.0-beta1, doctrine/dbal 4.4.0).

[Kocal]

Thank you @ker0x.