Kris Mok created SPARK-23947:

             Summary: Add hashUTF8String convenience method to hasher classes
                 Key: SPARK-23947
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.4.0
            Reporter: Kris Mok

Add {{hashUTF8String()}} to the hasher classes to allow Spark SQL codegen to 
generate cleaner code for hashing {{UTF8String}}. No change in behavior 

Although with the introduction of SPARK-10399, the code size for hashing 
{{UTF8String}} is already smaller, it's still good to extract a separate 
function in the hasher classes so that the generated code can stay clean.

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