lostluck opened a new issue, #22901:
URL: https://github.com/apache/beam/issues/22901

   ### What would you like to happen?
   
   As a followup to #22900, there's an opportunity to optimize "short reads" 
for iterators that need to consume the required number of elements on Close 
before the next element can begin processing.
   
   If the coder type is Length Prefixed (strings, []bytes, custom coders, rows 
etc), it's possible to have a "skip" decoder that simply consumes the next 
values bytes, and avoid allocation the type in the first place.
   
   ### Issue Priority
   
   Priority: 3
   
   ### Issue Component
   
   Component: sdk-go


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