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Expand and grouping variables #122
Description
It looks like expand, combined with some grouping variables gives some strange results:
> df <- data.frame(a=1:2,b=3:4,c=5:6)
> df %>% expand(a,b,c)
Source: local data frame [8 x 3]
a b c
(int) (int) (int)
1 1 3 5
2 1 3 6
3 1 4 5
4 1 4 6
5 2 3 5
6 2 3 6
7 2 4 5
8 2 4 6
> df %>% group_by(a,b) %>% expand(a,b,c)
Source: local data frame [8 x 7]
b a a b a b c
(int) (int) (int) (int) (int) (int) (int)
1 3 1 1 3 1 3 5
2 3 1 1 3 2 4 6
3 3 1 2 4 1 3 5
4 3 1 2 4 2 4 6
5 4 2 1 3 1 3 5
6 4 2 1 3 2 4 6
7 4 2 2 4 1 3 5
8 4 2 2 4 2 4 6
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