timsaucer commented on code in PR #825:
URL: https://github.com/apache/datafusion-python/pull/825#discussion_r1722541874
##########
python/datafusion/dataframe.py:
##########
@@ -524,3 +524,19 @@ def unnest_columns(self, *columns: str, preserve_nulls:
bool = True) -> DataFram
"""
columns = [c for c in columns]
return DataFrame(self.df.unnest_columns(columns,
preserve_nulls=preserve_nulls))
+
+ def __arrow_c_stream__(self, requested_schema: pa.Schema) -> Any:
+ """Export an Arrow PyCapsule Stream.
+
+ This will execute and collect the DataFrame. We will attempt to
respect the
+ requested schema, but only trivial transformations will be applied
such as only
+ returning the fields listed in the requested schema if their data
types match
+ those in the DataFrame.
Review Comment:
No, still on my todo list above. I'll move the PR to ready to review as soon
as all those 3 things are done.
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