public static String validColumnName(String identifier)
    {
        if (identifier.isEmpty() || identifier.equals(EMPTY_COLUMN_NAME)) {
            return "\"\"";
        }

        return validIdentifier(identifier);
    }
@Test
    public void testValidColumnName()
    {
        assertEquals("foo", validColumnName("foo"));
        assertEquals("\"\"", validColumnName(CassandraCqlUtils.EMPTY_COLUMN_NAME));
        assertEquals("\"\"", validColumnName(""));
        assertEquals("\"select\"", validColumnName("select"));
    }