paleolimbot commented on code in PR #40070:
URL: https://github.com/apache/arrow/pull/40070#discussion_r1504495011
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python/pyarrow/ipc.pxi:
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@@ -772,6 +772,38 @@ cdef class RecordBatchReader(_Weakrefable):
def __exit__(self, exc_type, exc_val, exc_tb):
self.close()
+ def cast(self, target_schema):
+ """
+ Wrap this reader with one that casts each batch lazily as it is pulled.
+ Currently only a safe cast to target_schema is implemented.
+
+ Parameters
+ ----------
+ target_schema : Schema
+ Schema to cast to, the names and order of fields must match.
+
+ Returns
+ -------
+ RecordBatchReader
+ """
+ cdef:
+ shared_ptr[CSchema] c_schema
+ shared_ptr[CRecordBatchReader] c_reader
+ RecordBatchReader out
+
+ if self.schema.names != target_schema.names:
+ raise ValueError("Target schema's field names are not matching "
Review Comment:
Done!
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