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6
* NOTE: an object is identified by the OID of the row that primarily
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7
* defines the object, plus the OID of the table that that row appears in.
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8
* For example, a function is identified by the OID of its pg_proc row
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* of objects without assuming that OIDs are unique across tables.
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* Since attributes don't have OIDs of their own, we identify an attribute
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* comment by the objoid+classoid of its parent table, plus an "objsubid"
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* for a table itself, so that it is distinct from any column comment.
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* Currently, objsubid is unused and zero for all other kinds of objects,
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* but perhaps it might be useful someday to associate comments with