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Posted to issues@flink.apache.org by "jackylau (Jira)" <ji...@apache.org> on 2020/12/04 02:22:00 UTC
[jira] [Commented] (FLINK-20474) flink cep results of doc is not
right
[ https://issues.apache.org/jira/browse/FLINK-20474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17243648#comment-17243648 ]
jackylau commented on FLINK-20474:
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hi @[~dwysakowicz] ,could you look at this?
> 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
> Priority: Major
> 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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