return DEUtil.getExpression( cachedColumns[i] );
return DEUtil.getExpression( cachedColumn );
	private String getExpression( String columnName )	{		for ( int i = 0; i < cachedColumns.length; i++ )		{			if ( cachedColumns[i].getName( ).equals( columnName ) )			{				return DEUtil.getExpression( cachedColumns[i] );			}		}		return null;	}