Package org.apache.drill.exec.physical.impl.scan.v3

Provides the "version 3" scan framework (which can also be thought of as EVF version 2).

See: Description

Interface Summary

Interface	Description
ManagedReader	Extended version of a record reader which uses a size-aware batch mutator.
ReaderFactory<T extends SchemaNegotiator>	Creates a batch reader on demand.
ScanLifecycleBuilder.SchemaValidator
SchemaNegotiator	Negotiates the table schema with the scanner framework and provides context information for the reader.

Class Summary

Class	Description
FixedReceiver	Layer above the ResultSetLoader which handles standard conversions for scalar columns where the schema is known up front (i.e.
FixedReceiver.Builder
ScanLifecycleBuilder	Gathers options for the ScanLifecycle then builds a scan lifecycle instance.
ScanLifecycleBuilder.DummyReaderFactory

Exception Summary

Exception	Description
ManagedReader.EarlyEofException	Exception thrown from the constructor if the data source is empty and can produce no data or schema.

Package org.apache.drill.exec.physical.impl.scan.v3 Description

Provides the "version 3" scan framework (which can also be thought of as EVF version 2). This version provides basically the same API as version 2, but with an implementation driven by schema rather than vectors.

Build a scan using the ScanLifecycleBuilder. Provide a subclass of ReaderFactory that will create each of your ManagedReader instances as needed. The framework handles the details of schemas, missing columns, implicit columns and the rest.