Fix an oversight in convert_EXISTS_sublink_to_join
commit dcd647d7cf98e3393f919135f6e113e896781f60 Author: Tom Lane <tgl@sss.pgh.pa.us> Date: Mon Jan 18 18:17:52 2010 +0000 Fix an oversight in convert_EXISTS_sublink_to_join: we can't convert an EXISTS that contains a WITH clause. This would usually lead to a "could not find CTE" error later in planning, because the WITH wouldn't get processed at all. Noted while playing with an example from Ken Marshall.
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