Zhenning Zhang created KYLIN-5279:
-------------------------------------

             Summary: Default null collation for Kylin5.0 sqls should be 
null-last for ASC order and null-first for DESC order.
                 Key: KYLIN-5279
                 URL: https://issues.apache.org/jira/browse/KYLIN-5279
             Project: Kylin
          Issue Type: Bug
          Components: Query Engine
            Reporter: Zhenning Zhang
            Assignee: Zhenning Zhang
             Fix For: 5.0-alpha
         Attachments: image-2022-10-20-15-12-12-967.png

according to pgsql: [https://www.postgresql.org/docs/current/queries-order.html]

"By default, null values sort as if larger than any non-null value; that is, 
{{NULLS FIRST}} is the default for {{DESC}} order, and {{NULLS LAST}} 
otherwise."

currently, the result is:

!image-2022-10-20-15-12-12-967.png|width=1320,height=743!



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