edponce opened a new pull request #10395:
URL: https://github.com/apache/arrow/pull/10395


   This PR adds the sign function to the compute layer as a unary scalar 
function registered as "sign".
   The implementations results depend on the input type:
   * Floating-points: sign(x) = [-1,1]
   * Signed integrals: sign(x) = [-1,0,1]
   * Unsigned integrals: sign(x) = [0,1]


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