R对行/列的分配限制是多少？

Question

# A tibble: 50,576,842 x 2
      Id Tag                
   <dbl> <chr>              
 1     1 data               
 2     4 c#                 
 3     4 winforms           
 4     4 type-conversion    
 5     4 decimal            
 6     4 opacity            
 7     6 html               
 8     6 css                
 9     6 css3               
10     6 internet-explorer-7
# ... with 50,576,832 more rows