WriteToContinuousDataSource is a unary logical operator (
LogicalPlan) that is created exclusively when
ContinuousExecution is requested to run a streaming query in continuous mode (to create an IncrementalExecution).
WriteToContinuousDataSource is planned (translated) to a WriteToContinuousDataSourceExec unary physical operator (when
DataSourceV2Strategy execution planning strategy is requested to plan a logical query).
WriteToContinuousDataSource takes the following to be created:
WriteToContinuousDataSource uses empty output schema (which is exactly to say that no output is expected whatsoever).