Nothing
test_self_join <- function() {
dA <- mk_td("dA", c("x", "y"))
dB <- mk_td("dB", c("x", "y"))
expect_equal(c("x", "y"), column_names(dA))
expect_equal(c("x", "y"), colnames(dA))
d1 <- natural_join(dA, dA, by = "x", jointype = "LEFT")
expect_equal(2, length(column_names(d1)))
d2 <- natural_join(dA, dB, by = "x", jointype = "LEFT")
expect_equal(2, length(column_names(d2)))
invisible(NULL)
}
test_self_join()
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