Class Select.Fields<T>
- java.lang.Object
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- org.apache.beam.sdk.transforms.PTransform<PCollection<T>,PCollection<Row>>
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- org.apache.beam.sdk.schemas.transforms.Select.Fields<T>
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- All Implemented Interfaces:
java.io.Serializable
,HasDisplayData
- Enclosing class:
- Select
public abstract static class Select.Fields<T> extends PTransform<PCollection<T>,PCollection<Row>>
- See Also:
- Serialized Form
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Field Summary
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Fields inherited from class org.apache.beam.sdk.transforms.PTransform
name, resourceHints
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Constructor Summary
Constructors Constructor Description Fields()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description PCollection<Row>
expand(PCollection<T> input)
Override this method to specify how thisPTransform
should be expanded on the givenInputT
.Select.Fields<T>
withFieldNameAs(java.lang.String fieldName, java.lang.String fieldRename)
Add a single field to the selection, along with the name the field should take in the selected schema.Select.Fields<T>
withOutputSchema(Schema schema)
Rename all output fields to match the specified schema.-
Methods inherited from class org.apache.beam.sdk.transforms.PTransform
compose, compose, getAdditionalInputs, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, getResourceHints, populateDisplayData, setResourceHints, toString, validate, validate
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Method Detail
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withFieldNameAs
public Select.Fields<T> withFieldNameAs(java.lang.String fieldName, java.lang.String fieldRename)
Add a single field to the selection, along with the name the field should take in the selected schema. This Allows easily renaming fields while doing a select. In cases where the output of a select would otherwise contain conflicting names, this function must be used to rename one of the fields.
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withOutputSchema
public Select.Fields<T> withOutputSchema(Schema schema)
Rename all output fields to match the specified schema. If the specified schema is not compatible with the output schema a failure will be raised.
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expand
public PCollection<Row> expand(PCollection<T> input)
Description copied from class:PTransform
Override this method to specify how thisPTransform
should be expanded on the givenInputT
.NOTE: This method should not be called directly. Instead apply the
PTransform
should be applied to theInputT
using theapply
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 classPTransform<PCollection<T>,PCollection<Row>>
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