perf: Optimizing ScalarColumnHydrator::hydrateAllData (#12095)

Author: maxm86545

src/Internal/Hydration/ScalarColumnHydrator.php

@@ -7,7 +7,6 @@
 use Doctrine\DBAL\Driver\Exception;
 use Doctrine\ORM\Exception\MultipleSelectorsFoundException;
 
-use function array_column;
 use function count;
 
 /**
@@ -27,8 +26,6 @@ protected function hydrateAllData(): array
             throw MultipleSelectorsFoundException::create($this->resultSetMapping()->fieldMappings);
         }
 
-        $result = $this->statement()->fetchAllNumeric();
-
-        return array_column($result, 0);
+        return $this->statement()->fetchFirstColumn();
     }
 }