zenazn opened a new pull request, #37982:
URL: https://github.com/apache/arrow/pull/37982

   Previously, Tables constructed from vectors with null values would infer 
Schemas that did not permit null values. This resulted in downstream code 
making bad assumptions about the data. After this change, we always assume data 
can be nullable, and construct a Schema with nullable Fields.
   
   ### Are these changes tested?
   
   I informally tested these changes for my use case, but have not tested them 
more extensively
   
   ### Are there any user-facing changes?
   
   Yes: the `Table` constructor will now produce schemas with nullable `Fields` 
in situations in which it previously did not


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