mihaibudiu commented on PR #5293:
URL: https://github.com/apache/calcite/pull/5293#issuecomment-5944895815

   > A RANGE window without ORDER BY takes an implicit sort key from the FROM 
item's monotonic column. 
   
   What is a monotonic column?
   
   > select deptno, count(*) over () as c from emp group by deptno on the scott 
schema now returns DEPTNO=10/20/30 with C=3. The same shape with an explicit 
RANGE frame and max(max(sal)) over () grouped by job also converts. ROWS 
framing, an explicit ORDER BY, and GROUP BY of the monotonic column itself are 
unchanged.
   
   I am not sure I understand this


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