Patch-Magento-CatalogPermissions-EE_2.2.5_reindex_without_select_union.patch

--- a/Model/Indexer/AbstractAction.php
+++ b/Model/Indexer/AbstractAction.php
@@ -805,21 +805,23 @@ abstract class AbstractAction
             );
         }
 
-        $this->connection->query(
-            $this->connection->insertFromSelect(
-                $this->connection->select()->union($selects, \Magento\Framework\DB\Select::SQL_UNION_ALL),
-                $this->getProductIndexTempTable(),
-                [
-                    'product_id',
-                    'store_id',
-                    'customer_group_id',
-                    'grant_catalog_category_view',
-                    'grant_catalog_product_price',
-                    'grant_checkout_items'
-                ],
-                AdapterInterface::REPLACE
-            )
-        );
+        foreach ($selects as $select){
+            $this->connection->query(
+                $this->connection->insertFromSelect(
+                    $select,
+                    $this->getProductIndexTempTable(),
+                    [
+                        'product_id',
+                        'store_id',
+                        'customer_group_id',
+                        'grant_catalog_category_view',
+                        'grant_catalog_product_price',
+                        'grant_checkout_items'
+                    ],
+                    AdapterInterface::REPLACE
+                )
+            );
+        }
     }
 
     /**