Better Passing Data to an Interface

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Is your feature request related to a problem? Please describe.
Currently, we just pass cache to an interface in evaluation, so the cached variable can be picked up by the interface. I am planning to implement a column lookup function in an interface (for implementing ProjectEntity), which will check the database/datalake table alone the ProjectEntity's trunk using IRGraph.find_datasource_of_node(). However, that method will not stop by Variable and it does not know which Varible to stop (only cached Variable should stop it).

Describe the solution you'd like
Do not pass cache to an interface, instead, add Construct node to the IRGraphEvaluable flowing into cached Variable. In an interface, when the IRGraphEvaluable is evaluated, any Construct will be written into the database/datalake as a table, or handled in memory.