Package org.apache.drill.exec.physical.impl.protocol

Defines a revised implementation of the Drill RecordBatch protocol.

See: Description

Interface Summary

Interface	Description
BatchAccessor	Provides access to the row set (record batch) produced by an operator.
OperatorExec	Core protocol for a Drill operator execution.

Class Summary

Class	Description
IndirectContainerAccessor	Extension of the container accessor that holds an optional selection vector, presenting the batch row count as the selection vector count.
OperatorDriver	State machine that drives the operator executable.
OperatorRecordBatch	Modular implementation of the standard Drill record batch iterator protocol.
SchemaTracker	Tracks changes to schemas via "snapshots" over time.
TestOperatorRecordBatch	Test the implementation of the Drill Volcano iterator protocol that wraps the modular operator implementation.
VectorContainerAccessor	Wraps a vector container and optional selection vector in an interface simpler than the entire RecordBatch.

Enum Summary

Enum	Description
OperatorDriver.State

Package org.apache.drill.exec.physical.impl.protocol Description

Defines a revised implementation of the Drill RecordBatch protocol. This version separates concerns into specific classes, and creates as single "shim" class to implement the iterator protocol, deferring to specific classes as needed.

This version is an eventual successor to the original implementation which used the "kitchen sink" pattern to combine all functionality into s single, large record batch implementation.