[GitHub] [beam] damccorm opened a new issue, #20299: BeamSQL Pattern Recognization Functionality

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damccorm opened a new issue, #20299:
URL: https://github.com/apache/beam/issues/20299

   The goal of this Jira is to support the following syntax in BeamSQL:
   
   ```
   
   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
   
   ```
   
   
   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
   
   Imported from Jira [BEAM-9543](https://issues.apache.org/jira/browse/BEAM-9543). Original Jira may contain additional context.
   Reported by: amaliujia.


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