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postgres_fdw: Fix assertion in estimate_path_cost_size().

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Commit 08d2d58a2 added an assertion assuming that the retrieved_rows
estimate for a foreign relation, which is re-used to cost pre-sorted
foreign paths with local stats, is set to at least one row in
estimate_path_cost_size(), which isn't correct because if the relation
is a foreign table with tuples=0, the estimate would be set to 0 there
when not using remote estimates.

Per bug #16807 from Alexander Lakhin.  Back-patch to v13 where the
aforementioned commit went in.

Author: Etsuro Fujita
Reviewed-by: Kyotaro Horiguchi
Discussion: https://postgr.es/m/16807-9fe4e08fbaa5c7ce%40postgresql.org
This commit is contained in:
Etsuro Fujita
2021-02-05 15:30:02 +09:00
parent 6467661b6d
commit 984384129b
3 changed files with 31 additions and 1 deletions
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contrib/postgres_fdw/postgres_fdw.c
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@ -2810,7 +2810,7 @@ estimate_path_cost_size(PlannerInfo *root,
*/
if (fpinfo->rel_startup_cost >= 0 && fpinfo->rel_total_cost >= 0)
{
Assert(fpinfo->retrieved_rows >= 1);
Assert(fpinfo->retrieved_rows >= 0);
rows = fpinfo->rows;
retrieved_rows = fpinfo->retrieved_rows;