bjchambers opened a new pull request #521:
URL: https://github.com/apache/arrow-rs/pull/521


   # Which issue does this PR close?
   
   Closes #510.
   
   # Rationale for this change
   
   There is no reason the `nullif` kernel applies only to primitive arrays. I 
have found it useful for nulling out a field array to respect the null-ness of 
a struct for instance, and in supporting only primitive arrays limits the 
ability to do this.
   
   # What changes are included in this PR?
   
   A change to the implementation of `nullif` to support arbitrary `ArrayRef`.
   
   # Are there any user-facing changes?
   
   The signature of `nullif` has changed.
   


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