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The replica identity determination was "flawed": it fell back to the primary key if the marked index was dropped, which is a defensible choice, but logical decoding has a differing opinion and fails to provide usable tuple identity data in this case. "Fix" REPACK by refusing to use the primary key in that case. This is arguably broken behavior in RelationGetIndexList, but I'll refrain from changing that at this stage. Reported-by: Nathan Bossart <nathandbossart@gmail.com> Author: Matthias van de Meent <boekewurm+postgres@gmail.com> Author: Ewan Young <kdbase.hack@gmail.com> Backpatch-through: 19 Discussion: https://postgr.es/m/apCBRKCH8jwKiaSY@nathan