Al M created SPARK-24306:
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             Summary: Sort a Dataset with a lambda (like RDD.sortBy()
                 Key: SPARK-24306
                 URL: https://issues.apache.org/jira/browse/SPARK-24306
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.3.0
            Reporter: Al M


Dataset has many useful functions that do not require hard coded column names 
(e.g. flatMapGroups, map).  Currently the sort() function requires us to pass 
the column name as a string. 

It would be nice to have a function similar to the sortBy in RDD where i can 
define the keys in a lambda e.g.
{code:java}
ds.sortBy(record => record.id){code}



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