AngersZhuuuu commented on issue #27861: [SPARK-30707][SQL]Window function set 
partitionSpec as order spec when orderSpec is empty
URL: https://github.com/apache/spark/pull/27861#issuecomment-610139661
 
 
   @cloud-fan 
   redshift support don't need order by spec, presto seems same behavior with 
Postgres sql

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