qlong commented on code in PR #53458:
URL: https://github.com/apache/spark/pull/53458#discussion_r2795506706
##########
python/pyspark/pandas/data_type_ops/base.py:
##########
@@ -199,8 +199,17 @@ def _as_string_type(
else:
casted = index_ops.spark.column.cast(spark_type)
scol = F.when(index_ops.spark.column.isNull(),
null_str).otherwise(casted)
+
+ # Always get nullable from the Spark schema after the cast.
+ # Binary->String can be nullable when UTF-8 validation is enabled.
+ temp_sdf = index_ops._internal.spark_frame.select(scol)
Review Comment:
right. Moved it to binary_ops.py to reduce overhead
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