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Yibo CaiKrisztián Szűcs
691226bdb88
Yibo Cai authored and Krisztián Szűcs committed 6710dddd496
ARROW-11299: [Python] Fix invalid-offsetof warnings

Use unique_ptr to hold FunctionOptions derived classes instances to fix
`invalid-offsetof` python build warnings.

~/arrow/python/build/temp.linux-x86_64-3.6/_compute.cpp:26034:146:
warning: offsetof within non-standard-layout type ‘__pyx_obj_7pyarrow_8_compute__CastOptions’ is undefined [-Winvalid-offsetof]
 x_type_7pyarrow_8_compute__CastOptions.tp_weaklistoffset = offsetof(struct __pyx_obj_7pyarrow_8_compute__CastOptions, __pyx_base.__pyx_base.__weakref__);

Closes #9274 from cyb70289/offsetof

Authored-by: Yibo Cai <yibo.cai@arm.com>
Signed-off-by: Benjamin Kietzman <bengilgit@gmail.com>