Github user kl0u commented on the issue:
https://github.com/apache/flink/pull/3477
Hi @eliaslevy , @dawidwys is right, in fact if the state's name is "a" and
it has 2 matching events, there will be two returned keys "a_0" and "a_1". This
is definitely counterintuitive and the reason it is still there is for
backwards compatibility with previous versions.
I think this should be addressed but I would also suggest to also start a
discussion in the mailing list to see if people are ok with this. Unfortunately
we are not aware if anyone is using the `CEP` library at the moment.
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