[C++][CI] Valgrind errors in `parquet-arrow-reader-writer-test`

[pitrou]

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

The C++ Valgrind CI job has started failing, presumably due to PR #50271:
https://github.com/ursacomputing/crossbow/actions/runs/30420028008/job/90474739319#step:6:2850

The errors should be easy to fix, they are due to GTest's default string representation of FixedSizeListTestCase:

==17419== Use of uninitialised value of size 8
==17419==    at 0x6AC2052: _itoa_word (_itoa.c:184)
==17419==    by 0x6ACCC9B: __printf_buffer (vfprintf-process-arg.c:155)
==17419==    by 0x6AF2CC5: __vsnprintf_internal (vsnprintf.c:96)
==17419==    by 0x6AC9405: snprintf (snprintf.c:31)
==17419==    by 0x6679B18: testing::(anonymous namespace)::PrintByteSegmentInObjectTo(unsigned char const*, unsigned long, unsigned long, std::ostream*) (gtest-printers.cc:83)
==17419==    by 0x6679BB2: testing::(anonymous namespace)::PrintBytesInObjectToImpl(unsigned char const*, unsigned long, std::ostream*) (gtest-printers.cc:100)
==17419==    by 0x667B5B7: testing::internal::PrintBytesInObjectTo(unsigned char const*, unsigned long, std::ostream*) (gtest-printers.cc:132)
==17419==    by 0x435C652: PrintValue<parquet::arrow::FixedSizeListTestCase> (gtest-printers.h:316)
==17419==    by 0x435C652: void testing::internal::PrintWithFallback<parquet::arrow::FixedSizeListTestCase>(parquet::arrow::FixedSizeListTestCase const&, std::ostream*) (gtest-printers.h:362)
==17419==    by 0x435C660: void testing::internal::PrintTo<parquet::arrow::FixedSizeListTestCase>(parquet::arrow::FixedSizeListTestCase const&, std::ostream*) (gtest-printers.h:491)
==17419==    by 0x435C66E: Print (gtest-printers.h:883)
==17419==    by 0x435C66E: void testing::internal::UniversalPrint<parquet::arrow::FixedSizeListTestCase>(parquet::arrow::FixedSizeListTestCase const&, std::ostream*) (gtest-printers.h:1187)
==17419==    by 0x435C6AB: Print (gtest-printers.h:1065)
==17419==    by 0x435C6AB: std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > testing::PrintToString<parquet::arrow::FixedSizeListTestCase>(parquet::arrow::FixedSizeListTestCase const&) (gtest-printers.h:1225)
==17419==    by 0x435CBA8: testing::internal::ParameterizedTestSuiteInfo<parquet::arrow::TestFixedSizeListRoundTrip>::RegisterTests() (gtest-param-util.h:603)
==17419==    by 0x667B0C7: testing::internal::ParameterizedTestSuiteRegistry::RegisterTests() (gtest-param-util.h:736)
==17419==    by 0x66A6BBB: testing::internal::UnitTestImpl::RegisterParameterizedTests() (gtest.cc:2848)
==17419==    by 0x66A6C00: testing::internal::UnitTestImpl::PostFlagParsingInit() (gtest.cc:5800)
==17419==    by 0x66A6DE2: void testing::internal::InitGoogleTestImpl<char>(int*, char**) (gtest.cc:6957)
==17419==    by 0x66A6E37: testing::InitGoogleTest(int*, char**) (gtest.cc:6975)
==17419==    by 0x738A1E7: void testing::internal::InitGoogleMockImpl<char>(int*, char**) (gmock.cc:148)
==17419==    by 0x738A391: testing::InitGoogleMock(int*, char**) (gmock.cc:204)
==17419==    by 0x54529BE: main (gmock_main.cc:70)

Component(s)

C++, Continuous Integration

[pitrou]

cc @HuaHuaY

[HuaHuaY]

cc @HuaHuaY

I think it's the same issue as #50213. I will fix it within a day. Sorry for forgetting to add PrintTo.

[pitrou]

No worries. We always forget about this... oddity :)

[pitrou]

Issue resolved by pull request 50721
#50721