acrites opened a new pull request, #37631:
URL: https://github.com/apache/beam/pull/37631

   The new translator splits out the Schema proto from the toRowFn and 
fromRowFn's so that runners can check the Schema proto for compatibility 
updates such as reordering fields. Previously, the coder was simply translated 
as a custom java coder, which runners couldn't reason about.
   
   Since this is a potentially backwards incompatible change, this PR also adds 
PipelineOptions to the CoderTranslator's contexts so that we can preserve the 
old-style translation if the compatibility version is 2.71 or below (this is 
assuming this change makes it into the 2.72 release).
   
   This fixes a few issues related to Schemas and pipeline updates: addresses 
#36496, #30276, #29245.
   
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