Hardcoded random seed in unit test ReaderTest.projectColumnsMutation

[anlowee]

Bug description

Description

In unit test ReaderTest.projectColumnsMutation (located at here), the random skip seed is hardcoded to 42. Since the RNG used here seems to be the std::mt199937 (as defined here), when using clang-18 compile the velox on ARM64 and AMD64 architecture, the second assertion in this unit test can only be passed on AMD64. This is very likely caused by the RNG performs differently on different architecture due to some low level reasons.

Reproduction

We compiled the velox with the following flags with clang-18

FINAL CMAKE_CXX_FLAGS= -Wno-deprecated-declarations -march=armv8-a+crc+crypto -std=c++17 -D USE_VELOX_COMMON_BASE -D HAS_UNCAUGHT_EXCEPTIONS -fsigned-char -rtlib=compiler-rt -Wall -Wextra -Wno-unused        -W
no-unused-parameter        -Wno-sign-compare        -Wno-ignored-qualifiers        -Wno-range-loop-analysis          -Wno-mismatched-tags          -Wno-vla-cxx-extension          -Wno-c++20-designator         
 -Wno-c++20-extensions          -Wno-nullability-completeness          -Wno-gnu-designator          -Wno-c99-designator

And ran the unit test with the following command:

./_build/release/velox/dwio/common/tests/velox_dwio_common_test --gtest_filter=ReaderTest.projectColumnsMutation

On ARM64, the actual vector will always be 3, 4, 7, 9 which is different from the expected vector which is 0, 1, 3, 5, 6, 8.

System information

Velox System Info v0.0.2
Commit: 9f4419e201808bd3bc9fbe85415121c15651f341
CMake Version: 3.30.3
System: Linux-6.1.112+
Arch: aarch64
C++ Compiler: /usr/bin/c++
C++ Compiler Version: 18.1.8
C Compiler: /usr/bin/cc
C Compiler Version: 18.1.8
CMake Prefix Path: /usr/local;/usr;/;/usr/local;/usr/local;/usr/X11R6;/usr/pkg;/opt

Relevant logs

Expected equality of these values:
  expected->size()
    Which is: 6
  actual->size()
    Which is: 4
[  FAILED  ] ReaderTest.projectColumnsMutation (0 ms)
[----------] 1 test from ReaderTest (0 ms total)

[----------] Global test environment tear-down
[==========] 1 test from 1 test suite ran. (0 ms total)
[  PASSED  ] 0 tests.
[  FAILED  ] 1 test, listed below:
[  FAILED  ] ReaderTest.projectColumnsMutation