apache_beam.transforms.combiners module

A library of basic combiner PTransform subclasses.

class apache_beam.transforms.combiners.Mean

Bases: object

Combiners for computing arithmetic means of elements.

class Globally(label=None)

Bases: apache_beam.transforms.ptransform.PTransform

combiners.Mean.Globally computes the arithmetic mean of the elements.

expand(pcoll)

class PerKey(label=None)

Bases: apache_beam.transforms.ptransform.PTransform

combiners.Mean.PerKey finds the means of the values for each key.

expand(pcoll)

class apache_beam.transforms.combiners.Count

Bases: object

Combiners for counting elements.

class Globally(label=None)

Bases: apache_beam.transforms.ptransform.PTransform

combiners.Count.Globally counts the total number of elements.

expand(pcoll)

class PerKey(label=None)

Bases: apache_beam.transforms.ptransform.PTransform

combiners.Count.PerKey counts how many elements each unique key has.

expand(pcoll)

class PerElement(label=None)

Bases: apache_beam.transforms.ptransform.PTransform

combiners.Count.PerElement counts how many times each element occurs.

expand(pcoll)

class apache_beam.transforms.combiners.Top

Bases: object

Combiners for obtaining extremal elements.

static Of(*args, **kwargs)

static PerKey(*args, **kwargs)

static Largest(*args, **kwargs)

static Smallest(*args, **kwargs)

static LargestPerKey(*args, **kwargs)

static SmallestPerKey(*args, **kwargs)

class apache_beam.transforms.combiners.Sample

Bases: object

Combiners for sampling n elements without replacement.

static FixedSizeGlobally(*args, **kwargs)

static FixedSizePerKey(*args, **kwargs)

class apache_beam.transforms.combiners.ToList(label='ToList')

Bases: apache_beam.transforms.ptransform.PTransform

A global CombineFn that condenses a PCollection into a single list.

expand(pcoll)

class apache_beam.transforms.combiners.ToDict(label='ToDict')

Bases: apache_beam.transforms.ptransform.PTransform

A global CombineFn that condenses a PCollection into a single dict.

PCollections should consist of 2-tuples, notionally (key, value) pairs. If multiple values are associated with the same key, only one of the values will be present in the resulting dict.

expand(pcoll)