[jira] [Created] (ARROW-8467) [C++] Test cases using ArrayFromJSON assume only a little-endian platform

["Kazuaki Ishizaki (Jira)" <ji...@apache.org>]

Kazuaki Ishizaki created ARROW-8467:
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             Summary: [C++] Test cases using ArrayFromJSON assume only a little-endian platform
                 Key: ARROW-8467
                 URL: https://issues.apache.org/jira/browse/ARROW-8467
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Kazuaki Ishizaki


Test cases using ArrayFromJSON assumes little endian platform

The following test cases seem to assume little-endian platform.
TEST_F(TestChunkedArray, View) at https://github.com/apache/arrow/blob/master/cpp/src/arrow/table_test.cc#L175
TEST(TestArrayView, PrimitiveAsFixedSizeBinary) at https://github.com/apache/arrow/blob/master/cpp/src/arrow/array_view_test.cc#L105
TEST(TestArrayView, StructAsStructSimple) at https://github.com/apache/arrow/blob/master/cpp/src/arrow/array_view_test.cc#L126

One of examples is {{PrimitiveAsFixedSizeBinary}}.

{code}
TEST(TestArrayView, PrimitiveAsFixedSizeBinary) {
  auto arr = ArrayFromJSON(int32(), "[2020568934, 2054316386, null]");
  auto expected = ArrayFromJSON(fixed_size_binary(4), R"(["foox", "barz", null])");
  CheckView(arr, expected);
  CheckView(expected, arr);
}
{code}


The expected strings are represented in binary as follows:
{code}
"foox" = [0x66 0x6f 0x6f 0x78]
"barz" = [0x62 0x61 0x72 0x7a]
{code}

This test gives a value as raw int32. The current values assume only a little-endian platform as follows to generate the expected binary sequence.
{code}
2020568934 = 0x786f6f66
2054316386 = 0x7a726162
{code}



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