public void howToUseUpdateExpression() {
Table table = dynamo.getTable(TABLE_NAME);
table.updateItem(HASH_KEY, FIRST_CUSTOMER_ID, RANGE_KEY, ADDRESS_TYPE_WORK,
// update expression
"set #phoneAttributeName = :phoneAtributeValue",
new NameMap().with("#phoneAttributeName", "phone"),
new ValueMap().withStringSet(":phoneAtributeValue",
"123-456-7890", "987-654-3210")
);
GetItemOutcome outcome = table.getItemOutcome(new GetItemSpec()
.withPrimaryKey(HASH_KEY, FIRST_CUSTOMER_ID, RANGE_KEY, ADDRESS_TYPE_WORK)