Basic view/stream join problem (Logical Operator LO_CROSS error)

Question

Hi -
I am writing a CQL processor which processes a stream of events. It translates them 1:1 to another type of event, and also assigns a calculated Version field to the output events.
The inbound events have an ID field which may contain duplicates. The version is an internal sequence starting at 1 for each ID, and incrementing by ID each time another instance of that ID is seen.
Sample input (schema: ID, Payload):
1, abc
2, abc
3, abc
1, def
4, abc
2, defDesired output (schema: ID, Version, Payload):
1, 1, abc
2, 1, abc
3, 1, abc
1, 2, def
4, 1, def
2, 2, defI have defined a processor with a view that aggregates the inbound events in a fixed depth relation (I receive fewer than 1000 events/versions per ID), and try to join that to a transform query:
<view id="Versioner">
  select id, count(*)+1 as version
  from inboundEvents [partition by id rows 1000]
  group by id
</view>
<query id="Translator">
  select payload, ..., f.id, v.version
  from inboundEvents as f, Versioner as v
  where f.id=v.id
</query>Question 1 - when deploying, CEP gives this error, which I don't understand. What basic error am I making?
Description: unbound stream not allowed
Cause: A stream input was applied to Logical Operator LO_CROSS
Action: Do not use stream input for Logical Operator LO_CROSS> Question 2 - is there a better CQL pattern for this - it is ugly to need to fix the partition depth to 1000.
-thanks, Barney
Edited by: Barney on 10-Aug-2011 10:59

Answer 1

Q1 -"inboundEvents" is a Stream and a Stream without a window cannot be used in a Join
You could instead use the query
<query id="Translator">
RSTREAM (
  select payload, ..., f.id, v.version
  from inboundEvents[NOW] as f, Versioner as v
  where f.id=v.id
</query>Q2 - You do not need the PARTITION window. Instead, just use
<view id="Versioner">
  select id, count(*)+1 as version
  from inboundEvents
  group by id
</view>