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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