Re: pg_plan_advice

Sounds like we have a consensus. I have committed the three bug-fix
patches (unrelated to the retry-loop stuff) ...

Thanks again for committing these fixes, Robert! With all the fixes in
place, I and SQLsmith have reached another error:
CREATE TABLE t1(a int);
CREATE TABLE t2(b int);

SELECT 1 FROM t1 WHERE EXISTS
  (SELECT 1 FROM
    (SELECT 1 FROM
      (SELECT 1) LEFT JOIN t2 ON true),
    t2 WHERE a = b);

ERROR:  XX000: unique semijoin found for relids (b 3 5 7) but not observed during planning
LOCATION:  pgpa_plan_walker, pgpa_walker.c:153

Could you please have a look?

Best regards,
Alexander