KTable showing duplicate entries

[eeepmb]

Hi guys,
I just started to get my hand on the latest release of ksqlDB and tested it.
Right now I'm facing the problem that in contrast to the little example given on your landing page a table shows duplicate entries when inserting the same message again and again. According to issue #530 this should be fixed.

I set up a test environment with this tutorial and ran following commands in the cli:

CREATE STREAM input_stream_json (id STRING, diff STRING, name STRING, date STRING)
    WITH (VALUE_FORMAT='JSON', KAFKA_TOPIC='input', KEY='id', PARTITIONS=1, REPLICAS=1);

CREATE TABLE dedup_table (id STRING, diff STRING)
    WITH (
       kafka_topic = 'input',
       key = 'id',
       value_format = 'json'
);

CREATE STREAM output_stream AS
  SELECT s.id, s.diff, s.name, s.date
  FROM input_stream_json s
  WHERE s.diff != 'dedup_table.diff';

The desired output should be that output_stream only keeps unique messages regarding the diff value. However it contains all messages (and so does the table that should filter the duplicated entries).

print 'input';
Format:JSON
{"ROWTIME":1578562247160,"ROWKEY":"1","ID":"1","DIFF":"10","NAME":"me","DATE":"2018"}
{"ROWTIME":1578562247775,"ROWKEY":"1","ID":"1","DIFF":"10","NAME":"me","DATE":"2018"}
{"ROWTIME":1578562248333,"ROWKEY":"1","ID":"1","DIFF":"10","NAME":"me","DATE":"2018"}

select * from dedup_table;
|1578562244536          |1                      |1                      |10                     |
|1578562246424          |1                      |1                      |10                     |
|1578562248333          |1                      |1                      |10                     |

select * from output_stream;
|1578562247160      |1                  |1                  |10                 |me              |2018               |
|1578562247775      |1                  |1                  |10                 |me              |2018               |
|1578562248333      |1                  |1                  |10                 |me              |2018               |

Any help or advice would be highly appreciated. Thanks in advance.