robertwb commented on code in PR #31092:
URL: https://github.com/apache/beam/pull/31092#discussion_r1586618153
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model/fn-execution/src/main/proto/org/apache/beam/model/fn_execution/v1/beam_fn_api.proto:
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@@ -1063,6 +1087,10 @@ message StateAppendRequest {
// Represents a part of a logical byte stream. Elements within
// the logical byte stream are encoded in the nested context and
// multiple append requests are concatenated together.
+ // For OrderedListState, elements of TimeStampedValue<T> should be encoded
+ // with TimestampedValueCoder.of(LengthPrefixCoder.of(Coder<T>)), so that
+ // the request handler knows how to decode timestamps from the data without
Review Comment:
Given these are sort _keys_, let's keep them in the key slot. (In other
words, I'd rather optimized for cleanliness of the spec over matching an
existing internal implementation detail.)
It does not matter that the `TimestampedValue$TimestampedValueCoder` does
not agree here, we would just use a different `Coder<TimestampedValue>`. (We
need to explicitly ensure that the coder for T is LP anyway, so we shouldn't be
inferring coders here.)
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