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The previous coding here assumed that we didn't need to recheck any of the querytree tests made in exec_simple_check_plan(). I think we supposed that those properties were fully determined by the syntax of the source text and hence couldn't change. That is true for most of them, but at least hasTargetSRFs and hasAggs can change by dint of forcibly dropping an originally-referenced function and recreating it with new properties. That leads to "unexpected plan node type" or similar failures. These tests are pretty cheap compared to the cost of replanning, so rather than sweat over exactly which properties need to be rechecked, let's just recheck them all. Hence, factor out those tests into a new function exec_is_simple_query(), and rearrange callers as needed. A second problem in the same area was that if we failed during replanning or during exec_save_simple_expr(), we'd potentially leave behind now-dangling pointers to the old simple expression, potentially resulting in crashes later. To fix, clear those pointers before replanning. The v12 code looks quite different in this area but still has the bug about needing to recheck query simplicity. I chose to back-patch all of the plpgsql_simple.sql test script, which formerly didn't exist in this branch. Per bug #18497 from Nikita Kalinin. Back-patch to all supported branches. Discussion: https://postgr.es/m/18497-fe93b6da82ce31d4@postgresql.org
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