Package org.apache.beam.sdk.transforms
Class ToJson<T>
- java.lang.Object
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- org.apache.beam.sdk.transforms.PTransform<PCollection<T>,PCollection<java.lang.String>>
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- org.apache.beam.sdk.transforms.ToJson<T>
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- All Implemented Interfaces:
java.io.Serializable
,HasDisplayData
@Experimental public class ToJson<T> extends PTransform<PCollection<T>,PCollection<java.lang.String>>
ExperimentalCreates a
PTransform
that serializes UTF-8 JSON objects from aSchema
-aware PCollection (i.e.PCollection.hasSchema()
returns true). JSON format is compatible withJsonToRow
.For specifics of JSON serialization see
RowJson.RowJsonSerializer
.- 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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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description PCollection<java.lang.String>
expand(PCollection<T> rows)
Override this method to specify how thisPTransform
should be expanded on the givenInputT
.static <T> ToJson<T>
of()
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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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of
public static <T> ToJson<T> of()
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expand
public PCollection<java.lang.String> expand(PCollection<T> rows)
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<java.lang.String>>
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