Ashutosh Chauhan created HIVE-18711:

             Summary: Add percentile_cont and percentile_disc udaf
                 Key: HIVE-18711
             Project: Hive
          Issue Type: Bug
          Components: UDF
            Reporter: Ashutosh Chauhan

Most common way to implement this is via ordered aggregate which allows users 
to specify sort specification with group by clause. Some implementations also 
allow to use these with window functions.

Since Hive doesn't have concept of ordered aggregates yet, one possibility is 
to support these only for window functions where sort specification is also 
taken from window clause.

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