ENGCOM-4109: Cast attribute ID to integer - Fixes #20969 #20971

 - Merge Pull Request #20971 from k4emic/magento2:fix/20969
 - Merged commits:
   1. c5c5e41
   2. 77b0ae8

Author: magento-engcom-team

app/code/Magento/CatalogSearch/Model/Adapter/Mysql/Aggregation/DataProvider/SelectBuilderForAttribute.php

@@ -74,6 +74,8 @@ public function __construct(
     }
 
     /**
+     * Build select for attribute search
+     *
      * @param Select $select
      * @param AbstractAttribute $attribute
      * @param int $currentScope
@@ -101,7 +103,7 @@ public function build(Select $select, AbstractAttribute $attribute, int $current
             $subSelect = $select;
             $subSelect->from(['main_table' => $table], ['main_table.entity_id', 'main_table.value'])
                 ->distinct()
-                ->where('main_table.attribute_id = ?', $attribute->getAttributeId())
+                ->where('main_table.attribute_id = ?', (int) $attribute->getAttributeId())
                 ->where('main_table.store_id = ? ', $currentScopeId);
             if ($this->isAddStockFilter()) {
                 $subSelect = $this->applyStockConditionToSelect->execute($subSelect);
@@ -116,6 +118,8 @@ public function build(Select $select, AbstractAttribute $attribute, int $current
     }
 
     /**
+     * Is add stock filter
+     *
      * @return bool
      */
     private function isAddStockFilter()