Commits on Jan 27, 2021

1. Fix continuous aggregate privileges during update …

   Copy ACL privileges (grants) from the query view (user-facing object)
   to the internal objects (e.g., materialized hypertable, direct view,
   and partial view) when updating the extension to the new version. A
   previous change added such propagation of privileges when executing
   `GRANT` statements, but didn't apply it retrospectively to the
   internal objects of existing continuous aggregates.
   
   Having the right permissions on internal objects is also necessary for
   the watermark function used by real-time aggregation since it queries
   the materialized hypertable directly.
   
   The update script copies the ACL information from the user-facing view
   of every continuous aggregate to its internal objects (including the
   materialized hypertable and its chunks). This is done by direct insert
   into `pg_class` instead of executing a `GRANT` statement in the update
   script, since the latter will record the grant/ACL as an init
   privilege (i.e., the system believes the GRANT is for an extension
   object). The init privilege will prevent this ACL from being included
   in future dump files, since `pg_dump` only includes non-init
   privileges as it believes such privileges will be recreated with the
   extension.
   
   Fixes timescale#2825

   

   erimatnor committed Jan 27, 2021
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