Attachments to Doctrine Jira Issue DDC-1596 - https://github.com/doctrine/doctrine2/issues/2233

11144_SingleTablePersister.diff

diff --git a/lib/Doctrine/ORM/Persisters/SingleTablePersister.php b/lib/Doctrine/ORM/Persisters/SingleTablePersister.php
index 171264a..8cadfe2 100644
--- a/lib/Doctrine/ORM/Persisters/SingleTablePersister.php
+++ b/lib/Doctrine/ORM/Persisters/SingleTablePersister.php
@@ -48,12 +48,13 @@ class SingleTablePersister extends AbstractEntityInheritancePersister
 
         $columnList = parent::_getSelectColumnListSQL();
 
+        $rootClass  = $this->_em->getClassMetadata($this->_class->rootEntityName);
+        $tableAlias = $this->_getSQLTableAlias($rootClass->name);
+
         // Append discriminator column
         $discrColumn = $this->_class->discriminatorColumn['name'];
-        $columnList .= ', ' . $discrColumn;
+        $columnList .= ', ' . $tableAlias . '.' . $discrColumn;
 
-        $rootClass  = $this->_em->getClassMetadata($this->_class->rootEntityName);
-        $tableAlias = $this->_getSQLTableAlias($rootClass->name);
         $resultColumnName = $this->_platform->getSQLResultCasing($discrColumn);
 
         $this->_rsm->setDiscriminatorColumn('r', $resultColumnName);