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ARROW-11983: [Python] Avoid ImportError calling from_pandas in threaded code #9789

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ARROW-11983: [Python] Avoid ImportError calling from_pandas in threaded code #9789

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ARROW-11983: [Python] Avoid ImportError calling from_pandas in thread…
jorisvandenbossche Mar 24, 2021
f85b094
fixup
jorisvandenbossche Mar 25, 2021
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6 changes: 4 additions & 2 deletions python/pyarrow/pandas_compat.py
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,10 @@

import ast
from collections.abc import Sequence
from concurrent import futures
# import threading submodule upfront to avoid partially initialized
# module bug (ARROW-11983)
import concurrent.futures.thread # noqa
from copy import deepcopy
from itertools import zip_longest
import json
Expand Down Expand Up @@ -590,8 +594,6 @@ def _can_definitely_zero_copy(arr):
arrays = [convert_column(c, f)
for c, f in zip(columns_to_convert, convert_fields)]
else:
from concurrent import futures

arrays = []
with futures.ThreadPoolExecutor(nthreads) as executor:
for c, f in zip(columns_to_convert, convert_fields):
Expand Down