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cbe24a6dd8
In the previous coding, a user could queue up for an AccessExclusiveLock on a table they did not have permission to cluster, thus potentially interfering with access by authorized users who got stuck waiting behind the AccessExclusiveLock. This approach avoids that. cluster() has the same permissions-checking requirements as REINDEX TABLE, so this commit moves the now-shared callback to tablecmds.c and renames it, per discussion with Noah Misch.