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Posted to issues@spark.apache.org by "Le Xuan Tril (Jira)" <ji...@apache.org> on 2026/05/27 15:23:00 UTC

[jira] (SPARK-55792) Optimize DataFrame.diff axis=0 to avoid unpartitioned Window

    [ https://issues.apache.org/jira/browse/SPARK-55792 ]


    Le Xuan Tril deleted comment on SPARK-55792:
    --------------------------------------

was (Author: JIRAUSER312968):
[~devin-petersohn] Could you please take a look at this PR when you have a chance?
 
This PR optimizes `DataFrame.diff(axis=0)` and `Series.diff()` to avoid the unpartitioned Spark Window by range-partitioning on the natural order column and exchanging only boundary rows across partitions. The grouped `diff()` path is left unchanged.
 
Happy to address any feedback. Thank you!

> Optimize DataFrame.diff axis=0 to avoid unpartitioned Window
> ------------------------------------------------------------
>
>                 Key: SPARK-55792
>                 URL: https://issues.apache.org/jira/browse/SPARK-55792
>             Project: Spark
>          Issue Type: Bug
>          Components: Pandas API on Spark
>    Affects Versions: 4.1.1
>            Reporter: Devin Petersohn
>            Priority: Major
>              Labels: pull-request-available
>
> DataFrame.diff(axis=0) currently uses Spark's Window without a partition specification, which will have scaling issues for large datasets. We should try to optimize away the unbounded window (e.g., by using a partitioned window similar to other projects in the space).



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