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Columns get assigned incorrect names when joining if by vector in incorrect order #855

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jnolis opened this issue Dec 19, 2014 · 1 comment
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@jnolis
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@jnolis jnolis commented Dec 19, 2014

When I run the following code I get the output below using the the most recent master branch:

The code:

x <- data.frame(q=c("a","b","c"),r=c("d","e","f"),s=c("1","2","3"))
y <- data.frame(q=c("a","b","c"),r=c("d","e","f"),t=c("xxx","xxx","xxx"))
left_join(x,y,by=c("r","q"))

The output:

q r s   t
d a 1 xxx
e b 2 xxx
f c 3 xxx

The values in first two columns were swapped by the names were not. Either they should both swap (so the column order then becomes r q s t or the columns shouldn't be swapped in the first place.

@hadley
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@hadley hadley commented Dec 28, 2014

@romainfrancois could you please take a look?

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