Hi Postgressers,

Quick question, just curious - is there a way to access the members of a
`pg_node_tree` value within a Postgres query?  By pg_node_tree I mean for
example, the `ev_qual` field in the `pg_rewrite` table.  By "access the
members" I mean in the same way that you can access the members of a json
or jsonp value (using -> or ->>).  Is there anything analogous for


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