Vaclav Plajt created BEAM-4851:
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             Summary: Allow all operators to carry type descriptors of its 
element
                 Key: BEAM-4851
                 URL: https://issues.apache.org/jira/browse/BEAM-4851
             Project: Beam
          Issue Type: Sub-task
          Components: dsl-euphoria
            Reporter: Vaclav Plajt
            Assignee: Vaclav Plajt


We need to have an source of `TypeDesctiptor<T>` for each processed element 
type in order to set/obtain right coder for them. So each operator should be 
able to tell what is a type of its output, key and value (if applicable).



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