Add custom object class support #335
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Extension may have some database objects that need to exist/delete consistently. We might use dependencies to record these relation-ship and remove them consistently and clearly. More generally, this patch allows extensions to create their own auxiliary relations like system catalog in schema `pg_ext_aux`. The auxiliary relations can't exist alone and have their own dynamic oclass and callbacks to implement, including do_delete.
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Extension may have some database objects that need to exist/delete consistently. We might use dependencies to record these relation-ship and remove them consistently and clearly.
More generally, this patch allows extensions to create their own auxiliary relations like system catalog in schema
pg_ext_aux. The auxiliary relations can't exist alone and have their own dynamic oclass and callbacks to implement, including do_delete.fix #ISSUE_Number
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