[GitHub] [arrow] wgtmac commented on a diff in pull request #35298: GH-35297: [C++][IPC] Fix schema deserialization of map field

["wgtmac (via GitHub)" <gi...@apache.org>]

wgtmac commented on code in PR #35298:
URL: https://github.com/apache/arrow/pull/35298#discussion_r1175382767


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cpp/src/arrow/ipc/read_write_test.cc:
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@@ -271,6 +280,29 @@ TEST_F(TestSchemaMetadata, NestedFields) {
   CheckSchemaRoundtrip(schema);
 }
 
+// Verify that nullable=false is well-preserved for child fields of map type.
+TEST_F(TestSchemaMetadata, MapField) {
+  auto key = field("key", int32(), false);
+  auto item = field("item", int32(), false);

Review Comment:
   You may reproduce the bug with this test case without the fix. @lidavidm 



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