MAGETWO-95315: [2.3] Joins to grid collections causes MySQL exception due to ambiguous where clause

Author: iivashchenko

app/code/Magento/Sales/Model/ResourceModel/Order/Grid/Collection.php

@@ -35,4 +35,19 @@ public function __construct(
     ) {
         parent::__construct($entityFactory, $logger, $fetchStrategy, $eventManager, $mainTable, $resourceModel);
     }
+
+    /**
+     * @inheritdoc
+     */
+    protected function _initSelect()
+    {
+        parent::_initSelect();
+
+        $tableDescription = $this->getConnection()->describeTable($this->getMainTable());
+        foreach ($tableDescription as $columnInfo) {
+            $this->addFilterToMap($columnInfo['COLUMN_NAME'], 'main_table.' . $columnInfo['COLUMN_NAME']);
+        }
+
+        return $this;
+    }
 }

dev/tests/integration/testsuite/Magento/Sales/Model/ResourceModel/Order/Grid/CollectionTest.php

@@ -0,0 +1,45 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\Sales\Model\ResourceModel\Order\Grid;
+
+use Magento\TestFramework\Helper\Bootstrap;
+
+class CollectionTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * Tests collection properties.
+     *
+     * @throws \ReflectionException
+     * @return void
+     */
+    public function testCollectionCreate(): void
+    {
+        $objectManager = Bootstrap::getObjectManager();
+
+        /** @var Collection $gridCollection */
+        $gridCollection = $objectManager->get(Collection::class);
+        $tableDescription = $gridCollection->getConnection()
+            ->describeTable($gridCollection->getMainTable());
+
+        $mapper = new \ReflectionMethod(
+            Collection::class,
+            '_getMapper'
+        );
+        $mapper->setAccessible(true);
+        $map = $mapper->invoke($gridCollection);
+
+        self::assertInternalType('array', $map);
+        self::assertArrayHasKey('fields', $map);
+        self::assertInternalType('array', $map['fields']);
+        self::assertCount(count($tableDescription), $map['fields']);
+
+        foreach ($map['fields'] as $mappedName) {
+            self::assertContains('main_table.', $mappedName);
+        }
+    }
+}