[C++][CI] StructToStructSubset test failure with libc++ 22.1.1

[pitrou]

Describe the bug, including details regarding any error messages, version, and platform.

This has started appearing on MinGW CLang CI, see https://github.com/apache/arrow/actions/runs/23467758420/job/68341855187 for example

The root cause is in a libc++ change in std::multimap, see llvm/llvm-project#152370 (comment) . It's unclear yet whether our code or the libc++ change is incorrect.

Component(s)

C++, Continuous Integration

[pitrou]

@lidavidm @WillAyd FYI

[pitrou]

In any case, this can probably be worked around by calling lower_bound for the given key and then extract on the returned iterator.

[raulcd]

This is also happening on the verification nightly jobs:

• verify-rc-source-cpp-macos-conda-amd64

[tadeja]

Pasting part from the example logs (as it's slow to load) https://github.com/apache/arrow/actions/runs/23467758420/job/68341855187

[ RUN      ] Cast.StructToStructSubset
D:/a/arrow/arrow/cpp/src/arrow/testing/gtest_util.cc:111: Failure
Failed

@@ -0, +0 @@
-{a: 1}
-{a: 2}
-{a: 5}
+{a: 3}
+{a: 4}
+{a: 7}
Expected:
  -- is_valid: all not null
  -- child 0 type: uint8
    [
      1,
      2,
      5
    ]
Actual:
  -- is_valid: all not null
  -- child 0 type: uint8
    [
      3,
      4,
      7
    ]
Google Test trace:
D:/a/arrow/arrow/cpp/src/arrow/compute/kernels/scalar_cast_test.cc:3819: To type: uint8
D:/a/arrow/arrow/cpp/src/arrow/compute/kernels/scalar_cast_test.cc:3817: From type: uint8

D:/a/arrow/arrow/cpp/src/arrow/compute/kernels/test_util_internal.cc:103: Failure
...