hongyuhong created FLINK-6233:
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Summary: Support rowtime inner equi-join between two streams in the SQL API
Key: FLINK-6233
URL:
https://issues.apache.org/jira/browse/FLINK-6233 Project: Flink
Issue Type: Sub-task
Components: Table API & SQL
Reporter: hongyuhong
Assignee: hongyuhong
The goal of this issue is to add support for inner equi-join on proc time streams to the SQL interface.
Queries similar to the following should be supported:
{code}
SELECT o.rowtime , o.productId, o.orderId, s.rowtime AS shipTime
FROM Orders AS o
JOIN Shipments AS s
ON o.orderId = s.orderId
AND o.rowtime BETWEEN s.rowtime AND s.rowtime + INTERVAL '1' HOUR;
{code}
The following restrictions should initially apply:
* The join hint only support inner join
* The ON clause should include equi-join condition
* The time-condition {{o.rowtime BETWEEN s.rowtime AND s.rowtime + INTERVAL '1' HOUR}} only can use rowtime that is a system attribute, the time condition only support bounded time range like {{o.rowtime BETWEEN s.rowtime - INTERVAL '1' HOUR AND s.rowtime + INTERVAL '1' HOUR}}, not support unbounded like {{o.rowtime > s.rowtime }}, and should include both two stream's rowtime attribute, {{o.rowtime between rowtime () and rowtime () + 1}} should also not be supported.
An row-time streams join will not be able to handle late data, because this would mean in insert a row into a sorted order shift all other computations. This would be too expensive to maintain. Therefore, we will throw an error if a user tries to use an row-time stream join with late data handling.
This issue includes:
* Design of the DataStream operator to deal with stream join
* Translation from Calcite's RelNode representation (LogicalJoin).
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