Re: Why is DEFAULT_FDW_TUPLE_COST so insanely low? - Mailing list pgsql-hackers

It seems that the test is still not stable on 32-bit machines even after
4b14e18714.  I see the following plan diff on cfbot [1].

--- /tmp/cirrus-ci-build/contrib/postgres_fdw/expected/postgres_fdw.out 2023-11-02 11:35:12.016196978 +0000
+++ /tmp/cirrus-ci-build/build-32/testrun/postgres_fdw/regress/results/postgres_fdw.out 2023-11-02 11:42:09.092242808 +0000
@@ -4022,24 +4022,21 @@
 -- subquery using stable function (can't be sent to remote)
 PREPARE st2(int) AS SELECT * FROM ft1 t1 WHERE t1.c1 < $2 AND t1.c3 IN (SELECT c3 FROM ft2 t2 WHERE c1 > $1 AND date(c4) = '1970-01-17'::date) ORDER BY c1;
 EXPLAIN (VERBOSE, COSTS OFF) EXECUTE st2(10, 20);
-                                                QUERY PLAN
-----------------------------------------------------------------------------------------------------------
- Sort
+                                                            QUERY PLAN
+----------------------------------------------------------------------------------------------------------------------------------
+ Nested Loop Semi Join
    Output: t1.c1, t1.c2, t1.c3, t1.c4, t1.c5, t1.c6, t1.c7, t1.c8
-   Sort Key: t1.c1
-   ->  Nested Loop Semi Join
+   Join Filter: (t2.c3 = t1.c3)
+   ->  Foreign Scan on public.ft1 t1
          Output: t1.c1, t1.c2, t1.c3, t1.c4, t1.c5, t1.c6, t1.c7, t1.c8
-         Join Filter: (t2.c3 = t1.c3)
-         ->  Foreign Scan on public.ft1 t1
-               Output: t1.c1, t1.c2, t1.c3, t1.c4, t1.c5, t1.c6, t1.c7, t1.c8
-               Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" < 20))
-         ->  Materialize
+         Remote SQL: SELECT "C 1", c2, c3, c4, c5, c6, c7, c8 FROM "S 1"."T 1" WHERE (("C 1" < 20)) ORDER BY "C 1" ASC NULLS LAST
+   ->  Materialize
+         Output: t2.c3
+         ->  Foreign Scan on public.ft2 t2
                Output: t2.c3
-               ->  Foreign Scan on public.ft2 t2
-                     Output: t2.c3
-                     Filter: (date(t2.c4) = '01-17-1970'::date)
-                     Remote SQL: SELECT c3, c4 FROM "S 1"."T 1" WHERE (("C 1" > 10))
-(15 rows)
+               Filter: (date(t2.c4) = '01-17-1970'::date)
+               Remote SQL: SELECT c3, c4 FROM "S 1"."T 1" WHERE (("C 1" > 10))
+(12 rows)

[1] https://api.cirrus-ci.com/v1/artifact/task/5727898984775680/testrun/build-32/testrun/postgres_fdw/regress/regression.diffs

Thanks
Richard