bkietz commented on a change in pull request #7026:
URL: https://github.com/apache/arrow/pull/7026#discussion_r416758776
##########
File path: python/pyarrow/_dataset.pyx
##########
@@ -41,6 +42,167 @@ def _forbid_instantiation(klass, subclasses_instead=True):
raise TypeError(msg)
+cdef class Expression:
+
+ cdef:
+ shared_ptr[CExpression] wrapped
+ CExpression* expr
+
+ def __init__(self, Buffer buffer=None):
+ if buffer is not None:
+ c_buffer = pyarrow_unwrap_buffer(buffer)
+ expr = GetResultValue(CExpression.Deserialize(deref(c_buffer)))
+ self.init(expr)
Review comment:
This would definitely be better but it gives me an error like
```
E _pickle.PicklingError: Can't pickle <built-in function
_deserialize>: attribute lookup _deserialize on pyarrow._dataset failed
```
I'll permute until this works.
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