kanterov edited a comment on issue #11034: [BEAM-9424] Allow grouping by LogicalType URL: https://github.com/apache/beam/pull/11034#issuecomment-594414157 @reuvenlax because `RowCoderGenerator` uses `Coder<BaseT>`, not `Coder<InputT>`. We know how to produce `Coder<BaseT>`, and we can make `Coder<InputT>` out of it using `LogicalType`. So the test fails because Row builder expected `EnumerationType.Value` but got `String`. What is special about Group is that it constructs coders for keys and values.
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