� This is the 1st commit message: Support Grouping Sets, Rollup and Cube to extend group by statement (apache#2039) [ADD] compatible with hive grouping clause (apache#2039) [ADD] support grouping functions in expr like grouping(a) + grouping(b) (apache#2039) [FIX] fix analyzer error in window function(apache#2039) � This is the commit message apache#2: Support Grouping Sets, Rollup and Cube to extend group by statement (apache#2039) [ADD] compatible with hive grouping clause (apache#2039) [ADD] support grouping functions in expr like grouping(a) + grouping(b) (apache#2039) [FIX] fix analyzer error in window function(apache#2039) clean some code style clean some code style [FIX] fix grouping functions not substitute in subquery(apache#2039) [ADD] add design docs [FIX] fix expr in groupby clause remove duplicate error[apache#2039] [FIX] fix code style problems add some comments [ADD] add fe unit test [FIX] fix according comments and add syntax check in where clause remve unused code fix by comments

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