apache_beam.dataframe.partitionings module

class apache_beam.dataframe.partitionings.Partitioning

Bases: object

A class representing a (consistent) partitioning of dataframe objects.

is_subpartitioning_of(other)

Returns whether self is a sub-partition of other.

Specifically, returns whether something partitioned by self is necissarily also partitioned by other.

partition_fn(df, num_partitions)

A callable that actually performs the partitioning of a Frame df.

This will be invoked via a FlatMap in conjunction with a GroupKey to achieve the desired partitioning.

test_partition_fn(df)

class apache_beam.dataframe.partitionings.Index(levels=None)

Bases: apache_beam.dataframe.partitionings.Partitioning

A partitioning by index (either fully or partially).

If the set of “levels” of the index to consider is not specified, the entire index is used.

These form a partial order, given by

Nothing() < Index([i]) < Index([i, j]) < … < Index() < Singleton()

The ordering is implemented via the is_subpartitioning_of method, where the examples on the right are subpartitionings of the examples on the left above.

is_subpartitioning_of(other)

partition_fn(df, num_partitions)

check(dfs)

class apache_beam.dataframe.partitionings.Singleton

Bases: apache_beam.dataframe.partitionings.Partitioning

A partitioning of all the data into a single partition.

is_subpartitioning_of(other)

partition_fn(df, num_partitions)

check(dfs)

class apache_beam.dataframe.partitionings.Nothing

Bases: apache_beam.dataframe.partitionings.Partitioning

A partitioning imposing no constraints on the actual partitioning.

is_subpartitioning_of(other)

test_partition_fn(df)

check(dfs)