Gilles Collingleft_join in R is silent when keys aren't unique. It just multiplies rows. The output has more rows than the input and nothing tells you.
Virginicus@GillesColling I can tell because the join doesn’t get done in a couple of seconds. 🙃
left_join in R is silent when keys aren't unique. It just multiplies rows. The output has more rows than the input and nothing tells you.