Takuya Ueshin created SPARK-42998:
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Summary: Fix DataFrame.collect with null struct.
Key: SPARK-42998
URL: https://issues.apache.org/jira/browse/SPARK-42998
Project: Spark
Issue Type: Sub-task
Components: Connect
Affects Versions: 3.4.0
Reporter: Takuya Ueshin
In Spark Connect:
{code:python}
>>> df = spark.sql("values (1, struct('a' as x)), (null, null) as t(a, b)")
>>> df.show()
+----+----+
| a| b|
+----+----+
| 1| {a}|
|null|null|
+----+----+
>>> df.collect()
[Row(a=1, b=Row(x='a')), Row(a=None, b=<Row()>)]
{code}
whereas PySpark:
{code:python}
>>> df.collect()
[Row(a=1, b=Row(x='a')), Row(a=None, b=None)]
{code}
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