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103512cee9
In commit 8c1d9d56e9a00680a035b8b333a98ea16b121eb7, I attempted to add a regression test that would fail if the target list was pushed into a parallel worker, but due to brain fade on my part, it just randomly fails whether anything bad or not, because the error check inside the parallel_restricted() function tests whether there is *any process in the system* that is not connected to a client, not whether the process running the query is not connected to a client. A little experimentation has left me pessimistic about the prospects of doing better here in a short amount of time, so let's just fall back to checking that the plan is as we expect and leave the execution-time check for another day.