816e336f12
Commit 7aea8e4f2daa4b39ca9d1309a0c4aadb0f7ed81b was overoptimistic about the degree of safety associated with running various functions in parallel mode. Functions that take a table name or OID as an argument are at least parallel-restricted, because the table might be temporary, and we currently don't allow parallel workers to touch temporary tables. Functions that take a query as an argument are outright unsafe, because the query could be anything, including a parallel-unsafe query. Also, the queue of pending notifications is backend-private, so adding to it from a worker doesn't behave correctly. We could fix this by transferring the worker's queue of pending notifications to the master during worker cleanup, but that seems like more trouble than it's worth for now. In addition to adjusting the pg_proc.h markings, also add an explicit check for this in async.c.
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