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Yuhong Hong reassigned FLINK-5658: ---------------------------------- Assignee: Yuhong Hong (was: sunjincheng) > Add event time OVER RANGE BETWEEN UNBOUNDED PRECEDING aggregation to SQL > ------------------------------------------------------------------------ > > Key: FLINK-5658 > URL: https://issues.apache.org/jira/browse/FLINK-5658 > Project: Flink > Issue Type: Sub-task > Components: Table API & SQL > Reporter: Fabian Hueske > Assignee: Yuhong Hong > > The goal of this issue is to add support for OVER RANGE aggregations on event > 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 UNBOUNDED > PRECEDING AND CURRENT ROW) AS sumB, > MIN(b) OVER (PARTITION BY c ORDER BY rowTime() 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. > - 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. > - bounded PRECEDING is not supported (see FLINK-5655) > - 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)