[DISCUSS]FLIP-XXX Add processing of unmatched events in Flink CEP

Hello! Our team works with Flink CEP library for real time events processing. But we noticed that some non-matching events are lost. We propose some changes in the Flink CEP library that provide the ability to handle non-matching events. We propose adding a new interface UnmatchedEventsHandler s

[DISCUSS] Flink CEP: to add processing of unmatched events

Hello. Early I asked how can I get access to unmatched events in CEP Pattern ( https://lists.apache.org/thread/p7n507jvm5hw0xmpoh0lcf87gf3yk18p). Unfortunately Biao Geng answered me, that "that currently there is no such API to access the middle NFA state". I have reviewed the realization of fli