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sunjincheng commented on FLINK-5804: ------------------------------------ Hi,guys,I made a preliminary implementation of this JIRA. My approach is: 1. Calcite -> Flink "LogicalProject with RexOver expression" – (normalize rule) -> "Calcite's LogicalWindow" – (opt rule) -> DataStreamRowWindowAggregate 2. datastreamAPI:(Without partitionBy situation): inputDS.map().setParallelism(1), map has implement CheckPointedFunction. 3. About OrderBy: According to the natural order of elements, procTime () use for generate end-time of the window and guaranteed pass the sql validation. > Add [non-partitioned] processing time OVER RANGE BETWEEN UNBOUNDED PRECEDING > aggregation to SQL > ----------------------------------------------------------------------------------------------- > > Key: FLINK-5804 > URL: https://issues.apache.org/jira/browse/FLINK-5804 > Project: Flink > Issue Type: Sub-task > Components: Table API & SQL > Reporter: sunjincheng > Assignee: sunjincheng > > 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 (ORDER BY procTime() RANGE BETWEEN UNBOUNDED PRECEDING AND > CURRENT ROW) AS sumB, > MIN(b) OVER (ORDER BY procTime() RANGE BETWEEN UNBOUNDED 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. > - Since no PARTITION BY clause is specified, the execution will be single > threaded. > - The ORDER BY clause may only have procTime() as parameter. procTime() is a > parameterless scalar function that just indicates processing time mode. > - bounded PRECEDING is not supported (see FLINK-5654) > - 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). -- This message was sent by Atlassian JIRA (v6.3.15#6346)