Bug 195970 Two issues when evaluate a query inlcuding a subquery[07]
Description: Currently, when evaluating a query which includes a subquery, the query will be evaluated twice. The binding of query will pass to subquery twice. If user write a java script such as new Date() and i++. The result of query will be incorrect. Another issue: when write the report document, the binding of query will be written twice and the performance is not good to evalulate it twice.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/ExprManagerUtil.java
result[i].addChild( n );
			}
		}
		return result;
	}
	/**
	 * 
	 * @param node
	 * @param nodes
	 * @return
	 */
	private Node getMatchedNode( Node node, Node[] nodes )
	{
		for ( int i = 0; i < nodes.length; i++ )
		{
			if ( nodes[i].equals( node ) )
				return nodes[i];
		}
		return null;
	}
	
	/**
	 * 
	 * @return
	 */
	private List getColumnNames( )
	{
		List bindingExprs = exprManager.getBindingExprs( );
		Map autoBindingExprMap = exprManager.getAutoBindingExprMap( );
		List l = new ArrayList( );