1 files changed, 6 insertions, 0 deletions
diff --git a/includes/database/select.inc b/includes/database/select.inc
index a8e763146..532b2e5a1 100644
--- a/includes/database/select.inc
+++ b/includes/database/select.inc
@@ -291,7 +291,13 @@ class SelectQuery extends Query implements QueryConditionInterface, QueryAlterab
   }
 
   public function execute() {
+    // Modules may alter all queries or only those having a particular tag.
     drupal_alter('query', $this);
+    if (isset($this->alterTags)) {
+      foreach ($this->alterTags as $tag => $value) {
+        drupal_alter("query_$tag", $this);
+      }
+    }
 
     $args = $this->getArguments();