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The feature will support Row Pattern Recognition syntax in SQL.  In December 2016, ISO released a new version of the international SQL standard (ISO/IEC 9075:2016) including the Row Pattern Recognition for complex event processing. Oracle's SQL has supported this feature in 12cR1. With this extension it is possible to detect complex patterns between rows in a table. In the context of CEP each row can be considered as an event and the events are ordered according to the insertion order. The following shows an example query.

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Required features in Flink-CEP

1. Support .times(from, to) on Pattern
2. Support branching CEP patterns. FLINK-4641
3. Support permutation on Pattern
4. Support .prune(long pruningTimestamp) on NFA
5. IterativeCondition support open() method to compile generated code and not de/serialized with NFA state.
6. Support pattern grouping in Flink CEP

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