org.apache.drill.exec.physical.impl.materialize

Interface QueryDataPackage

All Known Implementing Classes:

QueryDataPackage.DataPackage, QueryDataPackage.EmptyResultsPackage

public interface QueryDataPackage

Packages a batch from the Screen operator to send to its user connection. In the original Drill, that connection was always a network connection, and so the outgoing batch is serialized to a set of buffers ready to send. However, the REST server runs in the same process. The original REST query implementation serialized the data to buffers, then copied the data to a big buffer to be deserialized, causing significant memory pressure. This version allows the user connection to elect for serialization, or just to access the original source batch.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	QueryDataPackage.DataPackage Represents a batch of data with a schema.
static class	QueryDataPackage.EmptyResultsPackage Package that contains only a query ID.

Method Summary

Modifier and Type	Method and Description
VectorContainer	batch()
List<UserBitShared.SerializedField>	fields()
UserBitShared.QueryId	queryId()
QueryWritableBatch	toWritableBatch()

Method Detail

queryId

UserBitShared.QueryId queryId()

toWritableBatch

QueryWritableBatch toWritableBatch()

batch

VectorContainer batch()

fields

List<UserBitShared.SerializedField> fields()