What is the difference between union_all and bind_rows? They seem to be identical?
mtcars$model <- rownames(mtcars)
first <- mtcars[1:20, ]
second <- mtcars[10:32, ]
a <- union_all(first, second)
b <- bind_rows(first, second)
identical(a, b)
when the inputs are data.frames there is no difference, and union_all is in fact a wrapper of bind_rows (bind_rows is used in its code).
but union_all is generic in so far as it can operate over vector inputs as well
union_all(1:2,3)
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