jackylau created FLINK-20474:
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Summary: flink cep results of doc is not right
Key: FLINK-20474
URL: https://issues.apache.org/jira/browse/FLINK-20474
Project: Flink
Issue Type: Bug
Components: Library / CEP
Affects Versions: 1.12.0
Reporter: jackylau
Fix For: 1.13.0
h4. Contiguity within looping patterns
You can apply the same contiguity condition as discussed in the previous
[section|https://ci.apache.org/projects/flink/flink-docs-release-1.12/dev/libs/cep.html#combining-patterns]
within a looping pattern. The contiguity will be applied between elements
accepted into such a pattern. To illustrate the above with an example, a
pattern sequence {{"a b+ c"}} ({{"a"}} followed by any(non-deterministic
relaxed) sequence of one or more {{"b"}}’s followed by a {{"c"}}) with input
{{"a", "b1", "d1", "b2", "d2", "b3" "c"}} will have the following results:
# *Strict Contiguity*: {{{a b3 c}}} – the {{"d1"}} after {{"b1"}} causes
{{"b1"}} to be discarded, the same happens for {{"b2"}} because of {{"d2"}}.
# *Relaxed Contiguity*: {{{a b1 c}}}, {{{a b1 b2 c}}}, {{{a b1 b2 b3 c}}},
{{{a b2 c}}}, {{{a b2 b3 c}}}, {{{a b3 c}}} - {{"d"}}’s are ignored.
# *Non-Deterministic Relaxed Contiguity*: {{{a b1 c}}}, {{{a b1 b2 c}}}, {{{a
b1 b3 c}}}, {{{a b1 b2 b3 c}}}, {{{a b2 c}}}, {{{a b2 b3 c}}}, {{{a b3 c}}} -
notice the {{{a b1 b3 c}}}, which is the result of relaxing contiguity between
{{"b"}}’s.
{{"a b+ c"}} ({{"a"}} followed by any(non-deterministic relaxed) sequence of
one or more {{"b"}}’s followed by a {{"c"}}) is not correct at *followed by a
{{"c". it is nexted by a "c"}}*
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