org.apache.beam.sdk.io.gcp.bigquery

Class PrepareWrite<T,DestinationT>

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<PCollection<T>,PCollection<KV<DestinationT,TableRow>>>

org.apache.beam.sdk.io.gcp.bigquery.PrepareWrite<T,DestinationT>

All Implemented Interfaces:

java.io.Serializable, HasDisplayData

public class PrepareWrite<T,DestinationT>
extends PTransform<PCollection<T>,PCollection<KV<DestinationT,TableRow>>>

Prepare an input PCollection for writing to BigQuery. Use the table function to determine which tables each element is written to, and format the element into a TableRow using the user-supplied format function.

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.beam.sdk.transforms.PTransform

name

Constructor Summary

Constructors

Constructor and Description
PrepareWrite(DynamicDestinations<T,DestinationT> dynamicDestinations, SerializableFunction<T,TableRow> formatFunction)

Method Summary

Modifier and Type	Method and Description
PCollection<KV<DestinationT,TableRow>>	expand(PCollection<T> input) Override this method to specify how this PTransform should be expanded on the given InputT.

Methods inherited from class org.apache.beam.sdk.transforms.PTransform

compose, getAdditionalInputs, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, populateDisplayData, toString, validate

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

PrepareWrite

public PrepareWrite(DynamicDestinations<T,DestinationT> dynamicDestinations,
                    SerializableFunction<T,TableRow> formatFunction)

Method Detail

expand

public PCollection<KV<DestinationT,TableRow>> expand(PCollection<T> input)

Description copied from class: PTransform

Override this method to specify how this PTransform should be expanded on the given InputT.

NOTE: This method should not be called directly. Instead apply the PTransform should be applied to the InputT using the apply method.

Composite transforms, which are defined in terms of other transforms, should return the output of one of the composed transforms. Non-composite transforms, which do not apply any transforms internally, should return a new unbound output and register evaluators (via backend-specific registration methods).

Specified by:

expand in class PTransform<PCollection<T>,PCollection<KV<DestinationT,TableRow>>>