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由 Peter Eisentraut 提交于
Instead of expensive cross joins to resolve the ACL, add table-returning function aclexplode() that expands the ACL into a useful form, and join against that. Also, implement the role_*_grants views as a thin layer over the respective *_privileges views instead of essentially repeating the same code twice. fixes bug #4596 by Joachim Wieland, with cleanup by me
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