Introduce State Related Operators #2858
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aglinxinyuan
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Yicong-Huang
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Yicong-Huang
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This PR introduces
State to DataandData to Stateoperators, enabling users to convert between data and state.New Operator Groups and Constants:
STATE_GROUPtoOperatorGroupConstantsand updated the group hierarchy to include this new group.New Operators:
DataToStateOperator to convert data into state.StateToDataOperator to convert state back into data.The
State to Dataoperator retrieves the first tuple from the first port, converting it into a state while taking all tuples from the second port as data to pass downstream. The user can configure whether the state is passed once or to all downstream operators.The
Data to Stateoperator retrieves the first state from the input port, converting it into a tuple and output to the first output port while taking all tuples from the input port as data and output to the second output port. The user has to define the state's scheme.Even though this pair of operators will only take the first tuple/state, it's possible to nest multiple pairs of those operators to convert multiple tuples/states.
This pull request introduces a new feature for state management within the workflow system. The changes include adding new operator groups and implementing two new operators:
DataToStateOpDescandStateToDataOpDesc. These operators facilitate the conversion between data and state within workflows.