pitrou commented on a change in pull request #7992:
URL: https://github.com/apache/arrow/pull/7992#discussion_r477341587
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File path: cpp/src/arrow/ipc/metadata_internal.h
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@@ -48,6 +48,7 @@ namespace flatbuf = org::apache::arrow::flatbuf;
namespace ipc {
+class DictionaryFieldMapper;
class DictionaryMemo;
Review comment:
`DictionaryMemo` is still passed in some IPC reading APIs, I think. I
don't know if those are meant to be public.
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