[
https://issues.apache.org/jira/browse/SPARK-46684?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Hyukjin Kwon resolved SPARK-46684.
----------------------------------
Fix Version/s: 4.0.0
Resolution: Fixed
Issue resolved by pull request 44695
[https://github.com/apache/spark/pull/44695]
> CoGroup.applyInPandas/Arrow should pass arguments properly
> ----------------------------------------------------------
>
> Key: SPARK-46684
> URL: https://issues.apache.org/jira/browse/SPARK-46684
> Project: Spark
> Issue Type: Bug
> Components: Connect
> Affects Versions: 3.5.0
> Reporter: Takuya Ueshin
> Assignee: Takuya Ueshin
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
>
> In Spark Connect, {{CoGroup.applyInPandas/Arrow}} doesn't take arguments
> properly, so the arguments of the UDF can be broken:
> {noformat}
> >>> import pandas as pd
> >>>
> >>> df1 = spark.createDataFrame(
> ... [(1, 1.0, "a"), (2, 2.0, "b"), (1, 3.0, "c"), (2, 4.0, "d")], ("id",
> "v1", "v2")
> ... )
> >>> df2 = spark.createDataFrame([(1, "x"), (2, "y"), (1, "z")], ("id", "v3"))
> >>>
> >>> def summarize(left, right):
> ... return pd.DataFrame(
> ... {
> ... "left_rows": [len(left)],
> ... "left_columns": [len(left.columns)],
> ... "right_rows": [len(right)],
> ... "right_columns": [len(right.columns)],
> ... }
> ... )
> ...
> >>> df = (
> ... df1.groupby("id")
> ... .cogroup(df2.groupby("id"))
> ... .applyInPandas(
> ... summarize,
> ... schema="left_rows long, left_columns long, right_rows long,
> right_columns long",
> ... )
> ... )
> >>>
> >>> df.show()
> +---------+------------+----------+-------------+
> |left_rows|left_columns|right_rows|right_columns|
> +---------+------------+----------+-------------+
> | 2| 1| 2| 1|
> | 2| 1| 1| 1|
> +---------+------------+----------+-------------+
> {noformat}
> The result should be:
> {noformat}
> +---------+------------+----------+-------------+
> |left_rows|left_columns|right_rows|right_columns|
> +---------+------------+----------+-------------+
> | 2| 3| 2| 2|
> | 2| 3| 1| 2|
> +---------+------------+----------+-------------+
> {noformat}
>
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