GH-49295: [Python] Remove "mimalloc" from mandatory_backends (#49645)

kou · web-flow · commit ddc422944e5b · 2026-04-03T09:03:08.000+09:00
### Rationale for this change mimalloc is enabled by default but users can disable it. For example, Debian package disables it. If it's disabled, PyArrow tests are failed. ### What changes are included in this PR? Remove `"mimalloc"` from `mandatory_backends` in our test. ### Are these changes tested? Yes. ### Are there any user-facing changes? No. * GitHub Issue: #49295 Authored-by: Sutou Kouhei <kou@clear-code.com> Signed-off-by: Sutou Kouhei <kou@clear-code.com>
diff --git a/python/pyarrow/tests/test_memory.py b/python/pyarrow/tests/test_memory.py
@@ -30,9 +30,7 @@
 pytestmark = pytest.mark.processes
 
 possible_backends = ["system", "jemalloc", "mimalloc"]
-# Backends which are expected to be present in all builds of PyArrow,
-# except if the user manually recompiled Arrow C++.
-mandatory_backends = ["system", "mimalloc"]
+mandatory_backends = ["system"]
 
 
 def backend_factory(backend_name):
