That's not a bug, it's a feature (as they say). I suppose you could argue that a sequence only used by one table could inherit that table's permissions by default, but I can see problems when people reorder GRANT statements.
HTH
It's not feature, it's bug. From postgresql documentation 33.4. Rules and Privileges: <quote> Relations that are used due to rules get checked against the privileges of the rule owner, not the user invoking the rule. This means that a user only needs the required privileges for the tables/views that he names explicitly in his queries.</quote>
This dont' true for tables with serial fields.
-- Olleg Samoylov
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