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https://issues.apache.org/jira/browse/BEAM-9543?focusedWorklogId=450543&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-450543
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ASF GitHub Bot logged work on BEAM-9543:
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Author: ASF GitHub Bot
Created on: 24/Jun/20 17:18
Start Date: 24/Jun/20 17:18
Worklog Time Spent: 10m
Work Description: amaliujia commented on pull request #12073:
URL: https://github.com/apache/beam/pull/12073#issuecomment-648953111
You can run `./gradlew :core:check` to include style check. Some style check
can be fixed by this tool `./gradlew spotlessApply`.
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Issue Time Tracking
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Worklog Id: (was: 450543)
Remaining Estimate: 0h
Time Spent: 10m
> BeamSQL Pattern Recognization Functionality
> -------------------------------------------
>
> Key: BEAM-9543
> URL: https://issues.apache.org/jira/browse/BEAM-9543
> Project: Beam
> Issue Type: New Feature
> Components: dsl-sql
> Reporter: Rui Wang
> Assignee: Qihang Zeng
> Priority: P2
> Labels: gsoc, gsoc2020, mentor
> Time Spent: 10m
> Remaining Estimate: 0h
>
> The goal of this Jira is to support the following syntax in BeamSQL:
> {code:sql}
> SELECT T.aid, T.bid, T.cid
> FROM MyTable
> MATCH_RECOGNIZE (
> PARTITION BY userid
> ORDER BY proctime
> MEASURES
> A.id AS aid,
> B.id AS bid,
> C.id AS cid
> PATTERN (A B C)
> DEFINE
> A AS name = 'a',
> B AS name = 'b',
> C AS name = 'c'
> ) AS T
> {code}
> match_recognize is in SQL standard 2016. Currently Calcite also supports it.
> A good reference to match_recognize is [1]
> This will requires touch core components of BeamSQL:
> 1. SQL parser to support the syntax above.
> 2. SQL core to implement physical relational operator.
> 3. Distributed algorithms to implement a list of functions in a distributed
> manner.
> other references:
> Calcite match_recognize syntax [2]
> [1]:
> https://ci.apache.org/projects/flink/flink-docs-stable/dev/table/streaming/match_recognize.html
> [2]: https://calcite.apache.org/docs/reference.html#syntax-1
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