Based on answer from nightograph
private ArrayList<String> fetchItems() {
ArrayList<String> ids = new ArrayList<>();
ScanResult result = null;
do {
ScanRequest req = new ScanRequest();
req.setTableName("table_name");
if (result != null) {
req.setExclusiveStartKey(result.getLastEvaluatedKey());
}
result = amazonDynamoDBClient.scan(req);
List<Map<String, AttributeValue>> rows = result.getItems();
for (Map<String, AttributeValue> map : rows) {
AttributeValue v = map.get("rangeKey");
String id = v.getS();
ids.add(id);
}
} while (result.getLastEvaluatedKey() != null);
System.out.println("Result size: " + ids.size());
return ids;
}