Mview patch update

-- move framework logic to saas-export

Author: skovalenk

lib/internal/Magento/Framework/Mview/View/ChangeLogBatchIterator.php

@@ -55,6 +55,6 @@ public function walk(ChangelogInterface $changelog, int $fromVersionId, int $toV
             ->limit($batchSize);
 
         $select->from($changelogTableName, [$changelog->getColumnName()]);
-        return $connection->fetchAll($select);
+        return $connection->fetchCol($select);
     }
 }

lib/internal/Magento/Framework/Mview/View/Changelog.php

@@ -135,6 +135,10 @@ private function initAdditionalColumnData(): array
         $config = $this->mviewConfig->getView($this->getViewId());
         $additionalColumns = [];
 
+        if (!$config) {
+            return $additionalColumns;
+        }
+
         foreach ($config['subscriptions'] as $subscription) {
             if (isset($subscription['additional_columns'])) {
                 foreach ($subscription['additional_columns'] as $additionalColumn) {