Yueting Chen created FLINK-7169:
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Summary: Support AFTER MATCH SKIP function in CEP library API
Key: FLINK-7169
URL: https://issues.apache.org/jira/browse/FLINK-7169
Project: Flink
Issue Type: Task
Components: CEP
Reporter: Yueting Chen
Assignee: Yueting Chen
In order to support Oracle's MATCH_RECOGNIZE on top of the CEP library, we need
to support AFTER MATCH SKIP function in CEP API.
There're four options in AFTER MATCH SKIP, listed as follows:
1. AFTER MATCH SKIP TO NEXT ROW: resume pattern matching at the row after the
first row of the current match.
2. AFTER MATCH SKIP PAST LAST ROW: resume pattern matching at the next row
after the last row of the current match.
3. AFTER MATCH SKIP TO FIST *RPV*: resume pattern matching at the first row
that is mapped to the row pattern variable RPV.
4. AFTER MATCH SKIP TO LAST *RPV*: resume pattern matching at the last row that
is mapped to the row pattern variable RPV.
I think we can introduce a new function to `CEP` class, which takes a new
parameter as AfterMatchSKipStrategy.
The new API may looks like this
{code}
public static <T> PatternStream<T> pattern(DataStream<T> input, Pattern<T, ?>
pattern, AfterMatchSkipStrategy afterMatchSkipStrategy)
{code}
We can also make `SKIP TO NEXT ROW` as the default option, because that's what
CEP library behaves currently.
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