This patch adds sepgsql support for permission checks equivalent
to the existing SCHEMA USE privilege.
This feature is constructed on new OAT_SCHEMA_SEARCH event
type being invoked around pg_namespace_aclcheck().
So, its expected behavior also follows the behavior of existing
permissions; unprivileged schema is ignored from the search path,
or raise an error if object name is fully qualified.
This patch needs src/backend/catalog/objectaccess.c is existing,
so please apply this patch on top of this feature.
KaiGai Kohei <kaigai(at)kaigai(dot)gr(dot)jp>
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