Vishwanatha-HD commented on code in PR #48166:
URL: https://github.com/apache/arrow/pull/48166#discussion_r2589856710
##########
cpp/src/arrow/ipc/message_internal_test.cc:
##########
@@ -74,6 +76,29 @@ TEST(TestMessageInternal, TestByteIdentical) {
0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x66, 0x30, 0x00, 0x00,
0x08, 0x00,
0x0C, 0x00, 0x08, 0x00, 0x07, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x01,
0x40, 0x00, 0x00, 0x00};
+#else
+ // On Big-endian systems, FlatBuffer serialization can produce slightly
different
+ // output across different platforms and toolchains.
Review Comment:
Yes.. sure.. This is the code that I have right now.. (Code formatting is
not quite correct.. please dont mind)..
```
TEST(TestMessageInternal, TestByteIdentical) {
DictionaryFieldMapper mapper;
for (const auto endianness : {Endianness::Little, Endianness::Big}) {
// Create a simple Schema with just two metadata KVPs
auto f0 = field("f0", int64());
auto f1 = field("f1", int64());
std::vector<std::shared_ptr<Field>> fields = {f0, f1};
std::shared_ptr<KeyValueMetadata> metadata =
KeyValueMetadata::Make({"key_1", "key_2"}, {"key_1_value",
"key_2_value"});
auto schema = ::arrow::schema({f0}, endianness, metadata);
// Serialize the Schema to a Buffer
std::shared_ptr<Buffer> out_buffer;
ASSERT_OK(
WriteSchemaMessage(*schema, mapper, IpcWriteOptions::Defaults(),
&out_buffer));
// This is example output from macOS+ARM+LLVM
const uint8_t expected[] = {
0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0A, 0x00, 0x0E, 0x00, 0x06,
0x00, 0x05, 0x00,
0x08, 0x00, 0x0A, 0x00, 0x00, 0x00, 0x00, 0x01, 0x04, 0x00, 0x10,
0x00, 0x00, 0x00,
0x00, 0x00, 0x0A, 0x00, 0x0C, 0x00, 0x00, 0x00, 0x04, 0x00, 0x08,
0x00, 0x0A, 0x00,
0x00, 0x00, 0x6C, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x02,
0x00, 0x00, 0x00,
0x38, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0xD8, 0xFF, 0xFF,
0xFF, 0x18, 0x00,
0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x0B, 0x00, 0x00, 0x00, 0x6B,
0x65, 0x79, 0x5F,
0x32, 0x5F, 0x76, 0x61, 0x6C, 0x75, 0x65, 0x00, 0x05, 0x00, 0x00,
0x00, 0x6B, 0x65,
0x79, 0x5F, 0x32, 0x00, 0x00, 0x00, 0x08, 0x00, 0x0C, 0x00, 0x04,
0x00, 0x08, 0x00,
0x08, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00,
0x00, 0x0B, 0x00,
0x00, 0x00, 0x6B, 0x65, 0x79, 0x5F, 0x31, 0x5F, 0x76, 0x61, 0x6C,
0x75, 0x65, 0x00,
0x05, 0x00, 0x00, 0x00, 0x6B, 0x65, 0x79, 0x5F, 0x31, 0x00, 0x00,
0x00, 0x01, 0x00,
0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x10, 0x00, 0x14, 0x00, 0x08,
0x00, 0x06, 0x00,
0x07, 0x00, 0x0C, 0x00, 0x00, 0x00, 0x10, 0x00, 0x10, 0x00, 0x00,
0x00, 0x00, 0x00,
0x01, 0x02, 0x10, 0x00, 0x00, 0x00, 0x1C, 0x00, 0x00, 0x00, 0x04,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x66, 0x30, 0x00,
0x00, 0x08, 0x00,
0x0C, 0x00, 0x08, 0x00, 0x07, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x01,
0x40, 0x00, 0x00, 0x00};
Buffer expected_buffer(expected, sizeof(expected));
AssertBufferEqual(expected_buffer, *out_buffer);
}
}
```
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