Trait Engine 

pub trait Engine: AsAny {
    // Required methods
    fn evaluation_handler(&self) -> Arc<dyn EvaluationHandler> ;
    fn storage_handler(&self) -> Arc<dyn StorageHandler> ;
    fn json_handler(&self) -> Arc<dyn JsonHandler> ;
    fn parquet_handler(&self) -> Arc<dyn ParquetHandler> ;

    // Provided method
    fn plan_executor(&self) -> Arc<dyn PlanExecutor>  { ... }
}

The Engine trait encapsulates all the functionality an engine or connector needs to provide to the Delta Kernel in order to read the Delta table.

Engines/Connectors are expected to pass an implementation of this trait when reading a Delta table.

Required Methods

fn evaluation_handler(&self) -> Arc<dyn EvaluationHandler>

Get the connector provided EvaluationHandler.

fn storage_handler(&self) -> Arc<dyn StorageHandler>

Get the connector provided StorageHandler

fn json_handler(&self) -> Arc<dyn JsonHandler>

Get the connector provided JsonHandler.

fn parquet_handler(&self) -> Arc<dyn ParquetHandler>

Get the connector provided ParquetHandler.

Provided Methods

fn plan_executor(&self) -> Arc<dyn PlanExecutor>

Available on crate feature declarative-plans only.

Get the connector provided PlanExecutor.

The default implementation returns a trivial executor that errors on every operation.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl Engine for MeteredDeltaEngine

impl Engine for PlanBasedEngine

Available on crate feature declarative-plans and crate feature default-engine-base and (crate features arrow-conversion or declarative-plans or default-engine-base) only.