milesgranger commented on code in PR #14395:
URL: https://github.com/apache/arrow/pull/14395#discussion_r1012883181
##########
python/pyarrow/_compute.pyx:
##########
@@ -1168,6 +1168,46 @@ class SliceOptions(_SliceOptions):
self._set_options(start, stop, step)
+cdef class _ListSliceOptions(FunctionOptions):
+ cpdef _set_options(self, start, stop=None, step=1,
return_fixed_size_list=True):
+ # NB: Assigning optional[int64_t] on stack seems available once
Cython>=3 available.
+ # due to cpp_locals directive:
+ #
https://cython.readthedocs.io/en/latest/src/userguide/wrapping_CPlusPlus.html#cpp-locals-directive
Review Comment:
I was having a heck of a time getting a local variable initialized in the
function, always complaining:
```
CListSliceOptions* opts
optional[int64_t] c_stop
^
c++ class must have a nullary constructor to be stack allocated
```
Even taking the same arguments passed to the current `new
CListSliceOptions(...)` and attempting to assign them to `optional[int64_t]`
cdef variable right away would result in that error.
Is there a way you would expect to be able to at least initialize `nullopt`
and then I can update it with `stop` if not None?
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