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I see this was discussed a couple of years back in the thread "equals
metamethod and hash functions"  Some
alternatives were suggested, mostly involving string building.

I'm using tables as keys for another table, and I'm re-generating the
tables when I need the keys (I don't think there's a simple way for me
to retain references to the original keys).

Coming from a Java background, I was surprised to find that there
isn't a metamethod for this in lua (unless there is and I haven't
found it, of course ;)  I can probably work around my particular
problem if I need to, but I'm more interested in knowing about the
missing __hash function.