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The former code would only detect an unreachable WHEN clause if it had an AND condition. Fix, so that unreachable unconditional WHEN clauses are also detected. Back-patch to v15, where MERGE was added. Discussion: https://postgr.es/m/CAEZATCVQ=7E2z4cSBB49jjeGGsB6WeoYQY32NDeSvcHiLUZ=ow@mail.gmail.com