Rewrite dblink_record_internal() and dblink_fetch() to use a tuplestore
(SFRM_Materialize mode) to return tuples. Since we don't return from the dblink function in tuplestore mode, release the PGresult with a PG_CATCH block on error. Also rearrange to share the same code to materialize the tuplestore. Patch by Takahiro Itagaki.
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