MAGETWO-44159: Configurable product price in store front doesn't reflect price change from backend

Author: kandy

app/code/Magento/Catalog/Model/ResourceModel/Product/Indexer/Price/DefaultPrice.php

@@ -591,7 +591,7 @@ protected function _movePriceDataToIndexTable($entityIds = null)
         $select = $connection->select()->from($table, $columns);
 
         if ($entityIds !== null) {
-            $select->where('entity_id in (?)', $entityIds);
+            $select->where('entity_id in (?)', count($entityIds) > 0 ? $entityIds : 0);
         }
 
         $query = $select->insertFromSelect($this->getIdxTable(), [], false);

app/code/Magento/ConfigurableProduct/Model/ResourceModel/Product/Indexer/Price/Configurable.php

@@ -49,7 +49,7 @@ protected function reindex($entityIds = null)
     {
         if ($this->hasEntity() || !empty($entityIds)) {
             if (!empty($entityIds)) {
-                $allEntityIds = $this->getRelatedProduct($entityIds);
+                $allEntityIds = $this->getRelatedProducts($entityIds);
                 $this->prepareFinalPriceDataForType($allEntityIds, null);
             } else {
                 $this->_prepareFinalPriceData($entityIds);
@@ -67,7 +67,7 @@ protected function reindex($entityIds = null)
      * @param int[] $entityIds
      * @return int[]
      */
-    private function getRelatedProduct($entityIds)
+    private function getRelatedProducts($entityIds)
     {
         $select = $this->getConnection()->select()->union(
             [