godfrey he created FLINK-12665:
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Summary: Introduce MiniBatchIntervalInferRule and watermark
assigner operators
Key: FLINK-12665
URL: https://issues.apache.org/jira/browse/FLINK-12665
Project: Flink
Issue Type: New Feature
Components: Table SQL / Planner, Table SQL / Runtime
Reporter: godfrey he
Assignee: godfrey he
This issue aims to introduce MiniBatchIntervalInferRule to infer the mini-batch
interval of watermark assigner, This rule could handle the following two kinds
of operator:
1. supports operators which supports mini-batch and does not require watermark,
e.g. group aggregate. In this case, {{StreamExecWatermarkAssigner}} with
Protime mode will be created if not exist, and the interval value will be set
as {{SQL_EXEC_MINIBATCH_ALLOW_LATENCY}}.
2. supports operators which requires watermark, e.g. window join, window
aggregate. In this case, {{StreamExecWatermarkAssigner}} already exists, and
its MiniBatchIntervalTrait will be updated as the merged intervals from its
outputs.
Currently, mini-batched window aggregate is not supported, and will be
introduced later.
this issue also introduces watermark assigner operators, including:
1. {{WatermarkAssignerOperator}}, that extracts timestamps from stream elements
and generates periodic watermarks.
2. {{MiniBatchedWatermarkAssignerOperator}}, that extracts timestamps from
stream elements and generates watermarks with specified emit latency.
3. {{MiniBatchAssignerOperator}}, that emits mini-batch marker in a given
period.
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