hi all: 

If i have a agg with joint dim has 4-dim,  and i set the agg  Max Dimension 
Combination=3.  So will the result cuboid contain the 4-dim joint? 

I find when i set the Max Dimension Combination with 3.  the result cuboid 
contain some dim>3. 

|---- Cuboid 111111111111111111111111111111111111111111111111111, est row: 
34884166, est MB: 848.34      |---- Cuboid 
101111111110010000111111111111111110001000000000011, est row: 31152743, est MB: 
512.49, shrink: 89.3%          |---- Cuboid 
100000111110010000111111111111111110001000000000011, est row: 31305812, est MB: 
485.15, shrink: 100.49%              |---- Cuboid 
100000000010010000111111111111111110001000000000011, est row: 26002267, est MB: 
371.97, shrink: 83.06%                  |---- Cuboid  
100000000000000000001111111111111110001000000000011, est row: 18314746,  est 
MB: 240.16, shrink: 70.44%                      |---- Cuboid  
100000000000000000000000111111111110001000000000011, est row: 17152263,  est 
MB: 204.47, shrink: 93.65%                          |---- Cuboid  
100000000000000000000000000101111110001000000000011, est row: 11100040,  est 
MB: 116.44, shrink: 64.71%                              |---- Cuboid  
100000000000000000000000000000001110001000000000011, est row: 143320,  est MB: 
1.26, shrink: 1.29%                                  |---- Cuboid  
100000000000000000000000000000000000000000000000011, est row: 281, est  MB: 0, 
shrink: 0.2%                                      |---- Cuboid  
100000000000000000000000000000000000000000000000001, est row: 22, est  MB: 0, 
shrink: 7.83%                                      |---- Cuboid  
100000000000000000000000000000000000000000000000010, est row: 30, est  MB: 0, 
shrink: 10.68%

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