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https://issues.apache.org/jira/browse/BEAM-11881?focusedWorklogId=564186&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-564186
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ASF GitHub Bot logged work on BEAM-11881:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 11/Mar/21 00:44
Start Date: 11/Mar/21 00:44
Worklog Time Spent: 10m
Work Description: TheNeuralBit commented on a change in pull request
#14135:
URL: https://github.com/apache/beam/pull/14135#discussion_r591984316
##########
File path: sdks/python/apache_beam/dataframe/expressions.py
##########
@@ -312,6 +352,11 @@ def __init__(
requires_partition_by: The required (common) partitioning of the args.
preserves_partition_by: The level of partitioning preserved.
"""
+ assert preserves_partition_by != partitionings.Nothing(), (
+ "Preserving Nothing() partitioning is not allowed. Any expression "
+ "can trivially preserve at least Singleton() partitioning. If you "
+ "intend to indicate this expression can preserve _any_ partioning, use
"
+ "Index() instead.")
Review comment:
Done
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Issue Time Tracking
-------------------
Worklog Id: (was: 564186)
Time Spent: 3h 40m (was: 3.5h)
> DataFrame subpartitioning order is incorrect
> --------------------------------------------
>
> Key: BEAM-11881
> URL: https://issues.apache.org/jira/browse/BEAM-11881
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Reporter: Brian Hulette
> Priority: P2
> Labels: dataframe-api
> Time Spent: 3h 40m
> Remaining Estimate: 0h
>
> Currently we've defined
> Nothing() < Index([i]) < Index([i,j]) < .. < Index() < Singleton()
> s.t. Singleton is a subpartitoning of Index, is a subpartitioning of
> Index([i,j]), but this is incorrect. The order should be
> Singleton() < Index([i]) < Index([i,j]) < .. < Index() < Nothing()
> s.t. every other partitioning is a subpartitioning of Singleton. This is
> logical, since Singleton will collect the largest amount of data on a single
> node, partitioning by a single index will be alittle more distributed, and
> partitioning by the full Index() will be the most distribtued.
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