add eav_attribute_option join for ordering by sort_order column for attributes

Author: tansezer

app/code/Magento/Eav/Model/Entity/Attribute/Source/Table.php

@@ -213,7 +213,13 @@ public function addValueSortToCollection($collection, $dir = \Magento\Framework\
             $valueExpr
         );
 
-        $collection->getSelect()->order("{$attribute->getAttributeCode()} {$dir}");
+        $this->_attrOptionFactory->create()->addOptionToCollection(
+            $collection,
+            $attribute,
+            $valueExpr
+        );
+
+        $collection->getSelect()->order("{$attribute->getAttributeCode()}_order {$dir}");
 
         return $this;
     }

app/code/Magento/Eav/Model/ResourceModel/Entity/Attribute/Option.php

@@ -61,6 +61,33 @@ public function addOptionValueToCollection($collection, $attribute, $valueExpr)
         return $this;
     }
 
+    /**
+     * Add Join with option for collection select
+     *
+     * @param \Magento\Eav\Model\Entity\Collection\AbstractCollection $collection
+     * @param \Magento\Eav\Model\Entity\Attribute $attribute
+     * @param \Zend_Db_Expr $valueExpr
+     * @return $this
+     */
+    public function addOptionToCollection($collection, $attribute, $valueExpr)
+    {
+        $connection = $this->getConnection();
+        $attributeCode = $attribute->getAttributeCode();
+        $optionTable1 = $attributeCode . '_option_t1';
+        $tableJoinCond1 = "{$optionTable1}.option_id={$valueExpr}";
+        $valueExpr = $connection->getIfNullSql(
+            "{$optionTable1}.sort_order"
+        );
+
+        $collection->getSelect()->joinLeft(
+            [$optionTable1 => $this->getTable('eav_attribute_option')],
+            $tableJoinCond1,
+            ["{$attributeCode}_order" => $valueExpr]
+        );
+
+        return $this;
+    }
+
     /**
      * Retrieve Select for update Flat data
      *

app/code/Magento/Eav/Test/Unit/Model/Entity/Attribute/Source/TableTest.php

@@ -314,6 +314,9 @@ public function testAddValueSortToCollection()
         $attrOption->expects($this->once())->method('addOptionValueToCollection')
             ->with($collection, $this->abstractAttributeMock, $expr)
             ->willReturnSelf();
+        $attrOption->expects($this->once())->method('addOptionToCollection')
+            ->with($collection, $this->abstractAttributeMock, $expr)
+            ->willReturnSelf();
         $select->expects($this->once())->method('order')->with("{$attributeCode} {$dir}");
 
         $this->assertEquals($this->model, $this->model->addValueSortToCollection($collection, $dir));