pitrou commented on code in PR #37797:
URL: https://github.com/apache/arrow/pull/37797#discussion_r1352004534
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python/pyarrow/ipc.pxi:
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@@ -815,6 +817,73 @@ cdef class RecordBatchReader(_Weakrefable):
self.reader = c_reader
return self
+ def __arrow_c_stream__(self, requested_schema=None):
+ """
+ Export to a C ArrowArrayStream PyCapsule.
+
+ Parameters
+ ----------
+ requested_schema: Schema, default None
+ The schema to which the stream should be casted. Currently, this is
+ not supported and will raise a NotImplementedError if the schema
+ doesn't match the current schema.
+
+ Returns
+ -------
+ PyCapsule
+ A capsule containing a C ArrowArrayStream struct.
+ """
+ cdef:
+ ArrowArrayStream* c_stream
+
+ if requested_schema is not None:
+ out_schema = Schema._import_from_c_capsule(requested_schema)
+ # TODO: figure out a way to check if one schema is castable to
Review Comment:
There is `arrow::compute::CanCast` function that works on datatypes, and a
`Schema::AreCompatible` method that works on schemas. Can you open a followup
issue for this?
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