MAGETWO-86046: [Performance] Temp table temp_catalog_category_tree_index has no indexes for the columns parent_id and child_id

Author: slopukhov

app/code/Magento/Catalog/Model/Indexer/Category/Product/AbstractAction.php

@@ -608,6 +608,12 @@ protected function makeTempCategoryTreeIndex()
             ['type' => \Magento\Framework\DB\Adapter\AdapterInterface::INDEX_TYPE_PRIMARY]
         );
 
+        $temporaryTable->addIndex(
+            'child_id',
+            ['child_id'],
+            ['type' => \Magento\Framework\DB\Adapter\AdapterInterface::INDEX_TYPE_INDEX]
+        );
+
         // Drop the temporary table in case it already exists on this (persistent?) connection.
         $this->connection->dropTemporaryTable($temporaryName);
         $this->connection->createTemporaryTable($temporaryTable);