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If the query is rewritten into a NOTIFY command by a DO INSTEAD rule, we'd get an assertion failure, or in non-assert builds issue a rather confusing error message. Improve that. Also fix a longstanding grammar mistake in a nearby error message. Per bug #18664 from Alexander Lakhin. Back-patch to all supported branches. Tender Wang and Tom Lane Discussion: https://postgr.es/m/18664-ffd0ebc2386598df@postgresql.org