robertwb opened a new pull request, #31377:
URL: https://github.com/apache/beam/pull/31377

   ReadFromCsv with an explicit dtype produced graphs that had quadratic 
traversal (though the computed results, sets, were always correct).
   
   This fixes https://github.com/apache/beam/issues/31152 and should help other 
deep expressions with common references as well.
   
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