abe60b6a0d
If a plpython-language trigger caused another one to be invoked, the "TD" dictionary created for the inner one would overwrite the outer one's "TD" dictionary. This is more or less the same problem that 1d2fe56e4 fixed for ordinary functions in plpython, so fix it the same way, by saving and restoring "TD" during a recursive invocation. This fix makes an ABI-incompatible change in struct PLySavedArgs. I'm not too worried about that because it seems highly unlikely that any extension is messing with those structs. We could imagine doing something weird to preserve nominal ABI compatibility in the back branches, like keeping the saved TD object in an extra element of namedargs[]. However, that would only be very nominal compatibility: if anything *is* touching PLySavedArgs, it would likely do the wrong thing due to not knowing about the additional value. So I judge it not worth the ugliness to do something different there. (I also changed struct PLyProcedure, but its added field fits into formerly-padding space, so that should be safe.) Per bug #18456 from Jacques Combrink. This bug is very ancient, so back-patch to all supported branches. Discussion: https://postgr.es/m/3008982.1714853799@sss.pgh.pa.us
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