1788828d33
In the wake of the previous commit, we don't really need this anymore, since array assignment is primarily handled by the core code. The only way that that code could still be reached is that a GET DIAGNOSTICS target variable could be an array element. But that doesn't seem like a particularly essential feature. I'd added it in commit 55caaaeba, but just because it was easy not because anyone had actually asked for it. Hence, revert that patch and then remove the now-unreachable stuff. (If we really had to, we could probably reimplement GET DIAGNOSTICS using the new assignment machinery; but the cost/benefit ratio looks very poor, and it'd likely be a bit slower.) Note that PLPGSQL_DTYPE_RECFIELD remains. It's possible that we could get rid of that too, but maintaining the existing behaviors for RECORD-type variables seems like it might be difficult. Since there's not any functional limitation in those code paths as there was in the ARRAYELEM code, I've not pursued the idea. Discussion: https://postgr.es/m/4165684.1607707277@sss.pgh.pa.us
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