GitHub user Aitozi opened a pull request:
https://github.com/apache/flink/pull/6124
[FLINK-8914][CEP]Fix wrong semantic when greedy pattern is the head of the
pattern
## What is the purpose of the change
As described in the jira
[FLINK-8914](https://issues.apache.org/jira/projects/FLINK/issues/FLINK-8914)
There is something wrong with `greedy` when it is the head of the pattern.
Because the `NFA` process each `ComputationState` and will produce a new `Start
ComputationState`. So when it runs into the greedy match, other `start runs`
can also be set up
## Brief change log
*(for example:)*
- *Add a new StateType `Greedy` for convenience of distinguishing the
greedy in computations*
- *Remove the redundant start state during process*
## Verifying this change
Add two UT in `GreedyITCase`
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/Aitozi/flink greedyfix
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/6124.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #6124
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commit 76c1a4516b4bc98043d944335cc7a0aacd359278
Author: minwenjun <minwenjun@...>
Date: 2018-06-05T16:07:55Z
Fix wrong semantic when greedy pattern is the head of the pattern
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