[jira] [Created] (FLINK-12665) Introduce MiniBatchIntervalInferRule and watermark assigner operators

["godfrey he (JIRA)" <ji...@apache.org>]

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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