yangzhg opened a new pull request #2293: Support Grouping Sets, Rollup and Cube 
to extend group by statement
URL: https://github.com/apache/incubator-doris/pull/2293
 
 
   Support Grouping Sets, Rollup and Cube to extend group by statement
   support GROUPING SETS syntax 
   ```
   SELECT a, b, SUM( c ) FROM tab1 GROUP BY GROUPING SETS ( (a, b), (a), (b), ( 
) );
   ```
   cube  or rollup like 
   ```
   SELECT a, b,c, SUM( d ) FROM tab1 GROUP BY ROLLUP|CUBE(a,b,c)
   ```
   
   [ADD] support grouping functions in expr like grouping(a) + grouping(b) 
(#2039)
   [FIX] fix analyzer error in window function(#2039)

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