Deprecate getSingleScalarResult

This method is deprecated in SonataAdmin

src/Datagrid/ProxyQuery.php

@@ -291,8 +291,19 @@ public function getSortOrder()
         return $this->sortOrder;
     }
 
+    /**
+     * NEXT_MAJOR: Remove this method.
+     *
+     * @deprecated since sonata-project/doctrine-orm-admin-bundle 3.x, to be removed in 4.0.
+     */
     public function getSingleScalarResult()
     {
+        @trigger_error(sprintf(
+            'The method "%s()" is deprecated since sonata-project/doctrine-orm-admin-bundle 3.x'
+            .' and will be removed in version 4.0.',
+            __METHOD__,
+        ), \E_USER_DEPRECATED);
+
         $query = $this->queryBuilder->getQuery();
 
         return $query->getSingleScalarResult();

src/Datagrid/ProxyQueryInterface.php

@@ -31,7 +31,7 @@ public function getQueryBuilder();
 
 //    /**
 //     * This method should be preferred over `$this->getQueryBuilder()->getQuery()`
-//     * since some changed are done to the query builder in order to handle all the
+//     * since some changes are done to the query builder in order to handle all the
 //     * previously called Sonata\AdminBundle\Datagrid\ProxyQueryInterface methods.
 //     *
 //     * @return Query

src/Exporter/DataSource.php

@@ -51,7 +51,7 @@ public function createIterator(BaseProxyQueryInterface $query, array $fields): S
                 $doctrineQuery = $query->getQuery();
             }
         } else {
-            // Distinct is need to iterate, even if group by is used
+            // Distinct is needed to iterate, even if group by is used
             // @see https://github.com/doctrine/orm/issues/5868
             $query->getQueryBuilder()->distinct();
             $query->setFirstResult(null);