kangkaisen opened a new pull request #252: Doris support NULLS LAST and NULLS 
FIRST
URL: https://github.com/apache/incubator-doris/pull/252
 
 
   Currently, when  select * from table order by a,b,c desc,  the NULL value 
will be first. In real application, the users maybe want to the NULL value 
always be last or first. So,we should support NULLS LAST and NULLS FIRST 
grammar like Impala and Oracle.
   
   In fact, Doris BE has supported NULLS LAST and NULLS FIRST, we only need to 
make Doris FE support NULLS LAST and NULLS FIRST.

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