When joining vs not-joining the order of the key column is different in the output:
> dt = data.table(a = c(1:4), b = c(1:4), key = "b") > dt[J(1)] b a 1: 1 1 > dt[!J(1)] a b 1: 2 2 2: 3 3 3: 4 4 I don't usually care about column order, but this could become a surprise issue for people reading/writing to files. -- View this message in context: http://r.789695.n4.nabble.com/minor-formatting-issue-tp4665760.html Sent from the datatable-help mailing list archive at Nabble.com. _______________________________________________ datatable-help mailing list [email protected] https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help
