ueshin commented on code in PR #36640:
URL: https://github.com/apache/spark/pull/36640#discussion_r885963200
##########
python/pyspark/sql/session.py:
##########
@@ -611,8 +611,8 @@ def _inferSchema(
:class:`pyspark.sql.types.StructType`
"""
first = rdd.first()
- if not first:
- raise ValueError("The first row in RDD is empty, " "can not infer
schema")
+ if first is None:
Review Comment:
The `first` can be `None`.
```py
>>> print(sc.parallelize([None, 2, 3, 4]).first())
None
```
We should also check if `first is None` because `None` is not `Sized`.
```py
>>> isinstance(None, Sized)
False
```
Also we need a test to check the first row is `None` and it fails.
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