MC-19916: Attribute not showing on layered navigation if no value set for "All Store Views"

Author: rostyslav-hymon

app/code/Magento/Catalog/Model/ResourceModel/Product/Indexer/Eav/Source.php

@@ -8,6 +8,8 @@
 use Magento\Catalog\Model\Product\Attribute\Source\Status as ProductStatus;
 use Magento\Catalog\Api\Data\ProductInterface;
 use Magento\Catalog\Api\Data\ProductAttributeInterface;
+use Magento\Framework\DB\Select;
+use Magento\Framework\DB\Sql\UnionExpression;
 
 /**
  * Catalog Product Eav Select and Multiply Select Attributes Indexer resource model
@@ -199,13 +201,48 @@ protected function _prepareSelectIndex($entityIds = null, $attributeId = null)
                 'dd.attribute_id',
                 's.store_id',
                 'value' => new \Zend_Db_Expr('COALESCE(ds.value, dd.value)'),
-                'cpe.entity_id',
+                'cpe.entity_id AS source_id',
             ]
         );
 
         if ($entityIds !== null) {
             $ids = implode(',', array_map('intval', $entityIds));
+            $selectWithoutDefaultStore = $connection->select()->from(
+                ['wd' => $this->getTable('catalog_product_entity_int')],
+                [
+                    $productIdField,
+                    'attribute_id',
+                    'store_id',
+                    'value',
+                    $productIdField
+                ]
+            )->joinLeft(
+                ['d2d' => $this->getTable('catalog_product_entity_int')],
+                sprintf(
+                    "d2d.store_id = 0 AND d2d.{$productIdField} = wd.{$productIdField} AND d2d.attribute_id = %s",
+                    $this->_eavConfig->getAttribute(\Magento\Catalog\Model\Product::ENTITY, 'status')->getId()
+                ),
+                []
+            )->joinLeft(
+                ['d2s' => $this->getTable('catalog_product_entity_int')],
+                "d2s.store_id != 0 AND d2s.attribute_id = d2d.attribute_id AND " .
+                "d2s.{$productIdField} = d2d.{$productIdField}",
+                []
+            )
+                ->where((new \Zend_Db_Expr('COALESCE(d2s.value, d2d.value)')) . ' = ' . ProductStatus::STATUS_ENABLED)
+                ->where("wd.attribute_id IN({$attrIdsFlat})")
+                ->where('wd.value IS NOT NULL')
+                ->where('wd.store_id != 0')
+                ->where("wd.{$productIdField} IN({$ids})");
             $select->where("cpe.entity_id IN({$ids})");
+            $selects = new UnionExpression(
+                [$select, $selectWithoutDefaultStore],
+                Select::SQL_UNION,
+                '( %s )'
+            );
+
+            $select = $connection->select();
+            $select->from(['u' => $selects]);
         }
 
         /**
@@ -342,7 +379,7 @@ private function getMultiSelectAttributeWithSourceModels($attrIds)
             ProductAttributeInterface::ENTITY_TYPE_CODE,
             $criteria
         )->getItems();
-        
+
         $options = [];
         foreach ($attributes as $attribute) {
             $sourceModelOptions = $attribute->getOptions();