wesm commented on a change in pull request #8811:
URL: https://github.com/apache/arrow/pull/8811#discussion_r535540948
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File path: cpp/src/arrow/ipc/options.h
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@@ -65,6 +65,20 @@ struct ARROW_EXPORT IpcWriteOptions {
/// like compression
bool use_threads = true;
+ /// \brief Whether to emit dictionary deltas
+ ///
+ /// If false, a changed dictionary for a given field will emit a full
+ /// dictionary replacement.
+ /// If true, a changed dictionary will be compared against the previous
+ /// version. If possible, a dictionary delta will be omitted, otherwise
+ /// a full dictionary replacement.
+ ///
+ /// Default is false to maximize stream compatibility.
Review comment:
Might help to be explicit to say that otherwise the order of
dictionaries may be altered by a passage from sender to receiver (I assume
that's what you mean here by "stream compatibility" but others might be
scratching their heads)
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