Avoid duplicate keys when updating from select

Author: rain2o

app/code/Magento/Bundle/Model/ResourceModel/Indexer/Price.php

@@ -455,6 +455,42 @@ private function getBaseBundleSelectionPriceSelect(): Select
         return $select;
     }
 
+    /**
+     * Get base select for bundle selection price update
+     *
+     * @return Select
+     * @throws \Exception
+     */
+    private function getBaseBundleSelectionPriceUpdateSelect(): Select
+    {
+        $metadata = $this->metadataPool->getMetadata(ProductInterface::class);
+        $linkField = $metadata->getLinkField();
+        $bundleSelectionTable = $this->getBundleSelectionTable();
+
+        $select = $this->getConnection()->select()
+        ->join(
+            ['i' => $this->getBundlePriceTable()],
+            "i.entity_id = $bundleSelectionTable.entity_id
+             AND i.customer_group_id = $bundleSelectionTable.customer_group_id
+             AND i.website_id = $bundleSelectionTable.website_id",
+            []
+        )->join(
+            ['parent_product' => $this->getTable('catalog_product_entity')],
+            'parent_product.entity_id = i.entity_id',
+            []
+        )->join(
+            ['bo' => $this->getTable('catalog_product_bundle_option')],
+            "bo.parent_id = parent_product.$linkField AND bo.option_id = $bundleSelectionTable.option_id",
+            ['option_id']
+        )->join(
+            ['bs' => $this->getTable('catalog_product_bundle_selection')],
+            "bs.option_id = bo.option_id AND bs.selection_id = $bundleSelectionTable.selection_id",
+            ['selection_id']
+        );
+
+        return $select;
+    }
+
     /**
      * Apply selections price for fixed bundles
      *
@@ -498,7 +534,7 @@ private function applyFixedBundleSelectionPrice()
             ]
         );
 
-        $select = $this->getBaseBundleSelectionPriceSelect();
+        $select = $this->getBaseBundleSelectionPriceUpdateSelect();
         $select->joinInner(
             ['bsp' => $this->getTable('catalog_product_bundle_selection_price')],
             'bs.selection_id = bsp.selection_id AND bsp.website_id = i.website_id',