[BEAM-4592] Make Dataflow understand kind:varint as a well known since it already treats beam:coder:varint:v1 as a well known coder kind

• Type: Bug
• Status: Resolved
• Priority: P2
• Resolution: Fixed
• Fix Version/s: 2.6.0
• Component/s: runner-dataflow, sdk-py-core
• Labels: portability
• Assignee: Luke Cwik
• Reporter: Luke Cwik
• Created: 19/Jun/18 23:25
• Updated: 16/May/20 13:55
• Resolved: 21/Jun/18 21:56

Description

Also fix the Dataflow representation of CollectionToSingleton to use kind:stream as the outer output coder type instead of using kind:windowed_value

Issue Links

• links to: GitHub Pull Request #5689