ueshin commented on code in PR #42161:
URL: https://github.com/apache/spark/pull/42161#discussion_r1274361664
##########
python/pyspark/sql/pandas/serializers.py:
##########
@@ -385,37 +385,28 @@ def _create_struct_array(self, df, arrow_struct_type):
"""
import pyarrow as pa
- # Input partition and result pandas.DataFrame empty, make empty Arrays
with struct
- if len(df) == 0 and len(df.columns) == 0:
- arrs_names = [
- (pa.array([], type=field.type), field.name) for field in
arrow_struct_type
- ]
+ if len(df.columns) == 0:
+ return pa.array([{}] * len(df), arrow_struct_type)
Review Comment:
For example:
```py
>>> pdf = pd.DataFrame(index=[1,2,3])
>>> pdf
Empty DataFrame
Columns: []
Index: [1, 2, 3]
>>> len(pdf)
3
>>> len(pdf.columns)
0
```
or
```py
>>> pd.DataFrame([tuple(), tuple(), tuple()])
Empty DataFrame
Columns: []
Index: [0, 1, 2]
```
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