Core : Added CloneWithAlias function to DBSearch class. It creates a new DBObjectSearch from a DBSearch with a new alias.

SVN:trunk[3826]

core/dbsearch.class.php

@@ -155,6 +155,22 @@ abstract class DBSearch
 		return $oRetFilter;
 	}
 
+    /**
+     * Create a new DBObjectSearch from $oSearch with a new alias $sAlias
+     *
+     * Note : This has not be tested with UNION queries.
+     *
+     * @param DBSearch $oSearch
+     * @param string $sAlias
+     * @return DBObjectSearch
+     */
+    static public function CloneWithAlias(DBSearch $oSearch, $sAlias)
+    {
+        $oSearchWithAlias = new DBObjectSearch($oSearch->GetClass(), $sAlias);
+        $oSearchWithAlias = $oSearchWithAlias->Intersect($oSearch);
+        return $oSearchWithAlias;
+    }
+
     abstract public function ToOQL($bDevelopParams = false, $aContextParams = null);
 
 	static protected $m_aOQLQueries = array();