MAGETWO-94565: Catalog product collection filters produce errors and cause inconsistent behaviour

- Change fetchRow to fetchOne.

Author: YuliyaLabudova

app/code/Magento/Catalog/Model/ResourceModel/Category.php

@@ -1148,14 +1148,13 @@ public function getCategoryWithChildren(int $categoryId): array
     {
         $connection = $this->getConnection();
 
-        $select = $connection->select()
+        $selectAttributeCode = $connection->select()
             ->from(
                 ['eav_attribute' => $this->getTable('eav_attribute')],
                 ['attribute_id']
             )->where('entity_type_id = ?', CategorySetup::CATEGORY_ENTITY_TYPE_ID)
             ->where('attribute_code = ?', 'is_anchor')
             ->limit(1);
-        $attributeId = $connection->fetchRow($select);
 
         $select = $connection->select()
             ->from(
@@ -1167,7 +1166,7 @@ public function getCategoryWithChildren(int $categoryId): array
                 ['is_anchor' => 'cce_int.value']
             )->where(
                 'cce_int.attribute_id = ?',
-                $attributeId['attribute_id']
+                $connection->fetchOne($selectAttributeCode)
             )->where(
                 "cce.path LIKE '%/{$categoryId}' OR cce.path LIKE '%/{$categoryId}/%'"
             )->order('path');