Class ApproximateUnique.Globally<T>
- java.lang.Object
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- org.apache.beam.sdk.transforms.PTransform<PCollection<T>,PCollection<java.lang.Long>>
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- org.apache.beam.sdk.transforms.ApproximateUnique.Globally<T>
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- Type Parameters:
T
- the type of the elements in the inputPCollection
- All Implemented Interfaces:
java.io.Serializable
,HasDisplayData
- Enclosing class:
- ApproximateUnique
public static final class ApproximateUnique.Globally<T> extends PTransform<PCollection<T>,PCollection<java.lang.Long>>
PTransform
for estimating the number of distinct elements in aPCollection
.- 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 Instance Methods Concrete Methods Modifier and Type Method Description PCollection<java.lang.Long>
expand(PCollection<T> input)
Override this method to specify how thisPTransform
should be expanded on the givenInputT
.void
populateDisplayData(DisplayData.Builder builder)
Register display data for the given transform or component.-
Methods inherited from class org.apache.beam.sdk.transforms.PTransform
compose, compose, getAdditionalInputs, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, getResourceHints, setResourceHints, toString, validate, validate
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Constructor Detail
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Globally
public Globally(int sampleSize)
- See Also:
ApproximateUnique.globally(int)
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Globally
public Globally(double maximumEstimationError)
- See Also:
ApproximateUnique.globally(double)
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Method Detail
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expand
public PCollection<java.lang.Long> 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<java.lang.Long>>
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populateDisplayData
public void populateDisplayData(DisplayData.Builder builder)
Description copied from class:PTransform
Register display data for the given transform or component.populateDisplayData(DisplayData.Builder)
is invoked by Pipeline runners to collect display data viaDisplayData.from(HasDisplayData)
. Implementations may callsuper.populateDisplayData(builder)
in order to register display data in the current namespace, but should otherwise usesubcomponent.populateDisplayData(builder)
to use the namespace of the subcomponent.By default, does not register any display data. Implementors may override this method to provide their own display data.
- Specified by:
populateDisplayData
in interfaceHasDisplayData
- Overrides:
populateDisplayData
in classPTransform<PCollection<T>,PCollection<java.lang.Long>>
- Parameters:
builder
- The builder to populate with display data.- See Also:
HasDisplayData
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