BUGFIX: prevent creating new alias for indexBy column

Author: danfraticiu

src/Persisters/Entity/AbstractEntityInheritancePersister.php

@@ -40,7 +40,11 @@ protected function getSelectColumnSQL(string $field, ClassMetadata $class, strin
     {
         $tableAlias   = $alias === 'r' ? '' : $alias;
         $fieldMapping = $class->fieldMappings[$field];
-        $columnAlias  = $this->getSQLColumnAlias($fieldMapping->columnName);
+
+        $columnAlias = $this->currentPersisterContext->rsm->hasColumnAliasByField($alias, $field)
+            ? $this->currentPersisterContext->rsm->getColumnAliasByField($alias, $field)
+            : $this->getSQLColumnAlias($fieldMapping->columnName);
+
         $sql          = sprintf(
             '%s.%s',
             $this->getSQLTableAlias($class->name, $tableAlias),