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

Class PrepareWrite<InputT,DestinationT extends @NonNull Object,OutputT>

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<PCollection<InputT>,PCollection<KV<DestinationT,OutputT>>>

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

All Implemented Interfaces:

Serializable, HasDisplayData

public class PrepareWrite<InputT,DestinationT extends @NonNull Object,OutputT>
extends PTransform<PCollection<InputT>,PCollection<KV<DestinationT,OutputT>>>

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

annotations, displayData, name, resourceHints

Constructor Summary

Constructors

Constructor	Description
PrepareWrite(DynamicDestinations<InputT,DestinationT> dynamicDestinations, SerializableFunction<InputT,OutputT> formatFunction)

Method Summary

Modifier and Type	Method	Description
PCollection<KV<DestinationT,OutputT>>	expand(PCollection<InputT> 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

addAnnotation, compose, compose, getAdditionalInputs, getAnnotations, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, getResourceHints, populateDisplayData, setDisplayData, setResourceHints, toString, validate, validate

Methods inherited from class java.lang.Object

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

Constructor Details

PrepareWrite

public PrepareWrite(DynamicDestinations<InputT,DestinationT> dynamicDestinations,
 SerializableFunction<InputT,OutputT> formatFunction)

Method Details

expand

public PCollection<KV<DestinationT,OutputT>> expand(PCollection<InputT> 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<InputT>,PCollection<KV<DestinationT extends @NonNull Object,OutputT>>>