Reynold Xin created SPARK-20302:
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             Summary: Optimize cast when from and to types are structurally the 
same
                 Key: SPARK-20302
                 URL: https://issues.apache.org/jira/browse/SPARK-20302
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.1.0
            Reporter: Reynold Xin
            Assignee: Reynold Xin


When we perform a cast expression and the from and to types are structurally 
the same (having the same structure but different field names), we should be 
able to skip the actual cast.




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