Till Rohrmann created FLINK-3703:
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Summary: Add sequence matching semantics to discard matched events
Key: FLINK-3703
URL: https://issues.apache.org/jira/browse/FLINK-3703
Project: Flink
Issue Type: Improvement
Components: CEP
Affects Versions: 1.0.0, 1.1.0
Reporter: Till Rohrmann
Priority: Minor
There is no easy way to decide whether events can be part of multiple matching
sequences or not. Currently, the default is that an event can participate in
multiple matching sequences. E.g. if you have the pattern
{{Pattern.<Event>begin("a").followedBy("b")}} and the input event stream
{{Event("A"), Event("B"), Event("C")}}, then you will generate the following
matching sequences: {{Event("A"), Event("B")}}, {{Event("A"), Event("C")}} and
{{Event("B"), Event("C")}}.
It would be useful to allow the user to define where the matching algorithm
should continue after a matching sequence has been found. Possible option
values could be
* {{from first}} - continue keeping all events for future matches (that is the
current behaviour)
* {{after first}} - continue after the first element (remove first matching
event and continue with the second event)
* {{after last}} - continue after the last element (effectively discarding all
elements of the matching sequence)
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