ueshin opened a new pull request, #44696:
URL: https://github.com/apache/spark/pull/44696
### What changes were proposed in this pull request?
This is a backport of #44695.
Fix `CoGroup.applyInPandas/Arrow` to pass arguments properly.
### Why are the changes needed?
In Spark Connect, `CoGroup.applyInPandas/Arrow` doesn't take arguments
properly, so the arguments of the UDF can be broken:
```py
>>> 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|
+---------+------------+----------+-------------+
```
The result should be:
```py
+---------+------------+----------+-------------+
|left_rows|left_columns|right_rows|right_columns|
+---------+------------+----------+-------------+
| 2| 3| 2| 2|
| 2| 3| 1| 2|
+---------+------------+----------+-------------+
```
### Does this PR introduce _any_ user-facing change?
This is a bug fix.
### How was this patch tested?
Added the related tests.
### Was this patch authored or co-authored using generative AI tooling?
No.
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