[GitHub] [spark] zhengruifeng commented on a diff in pull request #36640: [SPARK-39262][PYTHON] Correct the behavior of creating DataFrame from an RDD

[GitBox <gi...@apache.org>]

zhengruifeng commented on code in PR #36640:
URL: https://github.com/apache/spark/pull/36640#discussion_r887596704


##########
python/pyspark/sql/session.py:
##########
@@ -611,8 +612,8 @@ 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 isinstance(first, Sized) and len(first) == 0:

Review Comment:
   what about filtering out the `None` rows:
   
   ```
   first  = rdd.filter( no None cond ).first()
   ```



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