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https://issues.apache.org/jira/browse/FLINK-12665?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kurt Young closed FLINK-12665.
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Resolution: Implemented
Fix Version/s: 1.9.0
merged in 1.9.0: 4fbf32356a1df34b9ed5ce0c484dfc9695cd7c4f
> 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
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.9.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> 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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