Now that I thought about it some more, what about choosing a slightly different pair of operators? By all means, pick `->` for one, but what about something like `->-` or `=>` or `~>` for the other? That way, PG (and MySQL?) users will suffer less mental friction when moving between databases. (I, for one, use both regularly, for wildly different purposes, but still. Oh, and I think the tilde and minus signs are easily distinguished in any programming font; less so on this forum.)