Make sure Yes/No attribute Layered Navigation filter will be joined from index table

Author: stkec

app/code/Magento/CatalogSearch/Model/Adapter/Mysql/Filter/Preprocessor.php

@@ -170,7 +170,7 @@ private function processQueryWithField(FilterInterface $filter, $isNegation, $qu
         } elseif ($filter->getField() === VisibilityFilter::VISIBILITY_FILTER_FIELD) {
             return '';
         } elseif ($filter->getType() === FilterInterface::TYPE_TERM &&
-            in_array($attribute->getFrontendInput(), ['select', 'multiselect'], true)
+            in_array($attribute->getFrontendInput(), ['select', 'multiselect', 'boolean'], true)
         ) {
             $resultQuery = $this->processTermSelect($filter, $isNegation);
         } elseif ($filter->getType() === FilterInterface::TYPE_RANGE &&

app/code/Magento/CatalogSearch/Model/Search/CustomAttributeFilterCheck.php

@@ -44,7 +44,7 @@ public function isCustom(FilterInterface $filter)
 
         return $attribute
             && $filter->getType() === FilterInterface::TYPE_TERM
-            && in_array($attribute->getFrontendInput(), ['select', 'multiselect'], true);
+            && in_array($attribute->getFrontendInput(), ['select', 'multiselect', 'boolean'], true);
     }
 
     /**