Kettle Join Rows - Closest Element Larger than x - pentaho

Question

Using pentaho kettle (also known as pdi), I have a "Join Rows (cartesian product)" step which merges two streams of data.
Both the first and second stream have a numeric value attached. For example,
Stream 1 - Values 1, 3, 5
Stream 2 - Values 2, 4, 6
I want to join the two streams to get the following output:
(1, 2)
(3, 4)
(5, 6)
I would describe the correct output as having stream 1 pick the smallest value which is larger than the value from stream 1.
Within the Join Rows step, I can specify stream 2 having a value greater than the stream 1 value. Unfortunately, this produces the following incorrect outcome:
(1, 2)
(1, 4)
(1, 6)
(3, 4)
(3, 6)
(5, 6)
Is there a different step that I should use instead of "Join Rows" in Kettle? Or am I missing a setting on the join rows step?
Note: I also looked at using a Stream Lookup step, but it only works for equals and not for my logic.
Thanks.

Answer 1

You're already half way there.
You have two inputs: Stream1 (1, 3, 5) and Stream2(2, 4, 6)
You join rows (make sure you sort them before joining) on value(stream2) > value(stream1)
You sort resulting stream on {value(Stream1), value(Stream2)
This gives you
(1, 2)
(1, 4)
(1, 6)
(3, 4)
(3, 6)
(5, 6)
Put the "Add Value Fields Changing Sequence" step and set the "Init
sequence if value of the following fields change" to value(Stream1).
Resulting stream is:
(Stream1, Stream2, result)
(1, 2, 1)
(1, 4, 2)
(1, 6, 3)
(3, 4, 1)
(3, 6, 2)
(5, 6, 1)
Put a filter step and filter on "result=1".
Resulting stream from "true" branch of the filter is the deisired result.
I uploaded "example.ktr" with the solution (I used Kettle 4.3. version):
example.ktr