Reynold Xin created SPARK-14251:
-----------------------------------

             Summary: Add SQL command for printing out generated code for 
debugging
                 Key: SPARK-14251
                 URL: https://issues.apache.org/jira/browse/SPARK-14251
             Project: Spark
          Issue Type: Improvement
          Components: SQL
            Reporter: Reynold Xin


SPARK-14227 adds a programatic way to dump generated code. In pure SQL 
environment this doesn't exist. It would be great if we can have 

{noformat}
explain codegen select * ...
{noformat}

return the generated code.




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