org.apache.beam.sdk.schemas.transforms

Class Select.Flattened<T>

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<PCollection<T>,PCollection<Row>>

org.apache.beam.sdk.schemas.transforms.Select.Flattened<T>

All Implemented Interfaces:

java.io.Serializable, HasDisplayData

Enclosing class:

Select

public static class Select.Flattened<T>
extends PTransform<PCollection<T>,PCollection<Row>>

A PTransform representing a flattened schema.

See Also:

Serialized Form

Field Summary

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

name

Method Summary

Modifier and Type	Method and Description
Select.Flattened<T>	concatFieldNames() For nested fields, concatenate all the names separated by a _ character in the flattened schema.
PCollection<Row>	expand(PCollection<T> input) Override this method to specify how this PTransform should be expanded on the given InputT.
Select.Flattened<T>	keepMostNestedFieldName() For nested fields, keep just the most-nested field name.
Select.Flattened<T>	withFieldNameAs(java.lang.String fieldName, java.lang.String fieldRename) Allows renaming a specific nested field.

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

compose, 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

Method Detail

concatFieldNames

public Select.Flattened<T> concatFieldNames()

For nested fields, concatenate all the names separated by a _ character in the flattened schema.

keepMostNestedFieldName

public Select.Flattened<T> keepMostNestedFieldName()

For nested fields, keep just the most-nested field name. Will fail if this name is not unique.

withFieldNameAs

public Select.Flattened<T> withFieldNameAs(java.lang.String fieldName,
                                           java.lang.String fieldRename)

Allows renaming a specific nested field. Can be used if two fields resolve to the same name with the default name policies.

expand

public PCollection<Row> 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<Row>>