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Date: Thu, 26 Jan 2017 13:48:24 +0000 (UTC)
From: "Fabian Hueske (JIRA)" <jira@apache.org>
To: dev@flink.apache.org
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Subject: [jira] [Created] (FLINK-5655) Add event time OVER RANGE BETWEEN x
 PRECEDING aggregation to SQL
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archived-at: Thu, 26 Jan 2017 13:48:45 -0000

Fabian Hueske created FLINK-5655:
------------------------------------

             Summary: Add event time OVER RANGE BETWEEN x PRECEDING aggregation to SQL
                 Key: FLINK-5655
                 URL: https://issues.apache.org/jira/browse/FLINK-5655
             Project: Flink
          Issue Type: Sub-task
          Components: Table API & SQL
            Reporter: Fabian Hueske


The goal of this issue is to add support for OVER RANGE aggregations on processing time streams to the SQL interface.

Queries similar to the following should be supported:
{code}
SELECT 
  a, 
  SUM(b) OVER (PARTITION BY c ORDER BY rowTime() RANGE BETWEEN INTERVAL '1' HOUR PRECEDING AND CURRENT ROW) AS sumB,
  MIN(b) OVER (PARTITION BY c ORDER BY rowTime() RANGE BETWEEN INTERVAL '1' HOUR PRECEDING AND CURRENT ROW) AS minB
FROM myStream
{code}

The following restrictions should initially apply:
- All OVER clauses in the same SELECT clause must be exactly the same.
- The PARTITION BY clause is optional (no partitioning results in single threaded execution).
- The ORDER BY clause may only have rowTime() as parameter. rowTime() is a parameterless scalar function that just indicates processing time mode.
- UNBOUNDED PRECEDING is not supported
- FOLLOWING is not supported.

The restrictions will be resolved in follow up issues. If we find that some of the restrictions are trivial to address, we can add the functionality in this issue as well.

This issue includes:
- Design of the DataStream operator to compute OVER ROW aggregates
- Translation from Calcite's RelNode representation (LogicalProject with RexOver expression).


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