[jira] [Created] (SPARK-16983) Add `prettyName` to row_number, dense_rank, percent_rank, cume_dist

["Dongjoon Hyun (JIRA)" <ji...@apache.org>]

Dongjoon Hyun created SPARK-16983:
-------------------------------------

             Summary: Add `prettyName` to row_number, dense_rank, percent_rank, cume_dist
                 Key: SPARK-16983
                 URL: https://issues.apache.org/jira/browse/SPARK-16983
             Project: Spark
          Issue Type: Bug
          Components: SQL
            Reporter: Dongjoon Hyun
            Priority: Minor


Currently, two-word window functions like `row_number`, `dense_rank`, `percent_rank`, and `cume_dist` are expressed without `_`. We had better show the correct name.

**Before**
{code}
scala> sql("select row_number()").show
java.lang.UnsupportedOperationException: Cannot evaluate expression: rownumber()
{code}

**After**
{code}
scala> sql("select row_number()").show
java.lang.UnsupportedOperationException: Cannot evaluate expression: row_number()
{code}




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