fallintoplace opened a new pull request, #1000:
URL: https://github.com/apache/arrow-go/pull/1000

   ### Rationale for this change
   
   MakeNullScalar represents a null extension scalar with a null storage 
scalar, which is also needed when appending extension scalars. Extension 
validation rejected that factory-created representation.
   
   ### What changes are included in this PR?
   
   Allow a null extension scalar to carry a validly formed null storage scalar 
while continuing to reject a non-null storage value. Add the extension type to 
the shared null-scalar validation coverage.
   
   ### Are these changes tested?
   
   Yes. go test ./arrow/scalar
   
   ### Are there any user-facing changes?
   
   Extension scalars returned by MakeNullScalar now pass Validate and 
ValidateFull.


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