--- title: The Version Number Is Not the Territory | daily.dev description: A PostgreSQL 14 instance on Amazon RDS produced an error message that community PostgreSQL 14 is architecturally incapable of generating — specifically a... canonical: https://daily.dev/posts/the-version-number-is-not-the-territory-fzlch2e1p twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: The Version Number Is Not the Territory | daily.dev og:description: A PostgreSQL 14 instance on Amazon RDS produced an error message that community PostgreSQL 14 is architecturally incapable of generating — specifically a... og:url: https://daily.dev/posts/the-version-number-is-not-the-territory-fzlch2e1p og:image: https://api.daily.dev/og/posts/fzLCH2e1p.png og:image:alt: The Version Number Is Not the Territory og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # The Version Number Is Not the Territory **[Planet PostgreSQL](https://daily.dev/sources/planet-postgresql)** · 4 min read · 0 upvotes · 0 comments ## Summary A PostgreSQL 14 instance on Amazon RDS produced an error message that community PostgreSQL 14 is architecturally incapable of generating — specifically a 'cannot SET ROLE' error from the logical replication apply worker. The root cause: RDS PostgreSQL is a patched fork that backported the apply-time role-switching behavior from PostgreSQL 16 into its v14 build, without any documentation in upstream release notes. The error occurs when replicated tables are owned by the reserved role 'rds_superuser', which nothing can SET ROLE to. The fix is to reassign those tables to an ordinary application role using ALTER TABLE ... OWNER TO. The broader lesson: on managed PostgreSQL platforms, the major version number does not fully describe the engine's behavior — providers carry invisible patches that can produce impossible-looking errors. ## Full article daily.dev links to this article rather than hosting it. 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