From: | Etsuro Fujita <efujita(at)postgresql(dot)org> |
---|---|
To: | pgsql-committers(at)lists(dot)postgresql(dot)org |
Subject: | pgsql: postgres_fdw: Fix assertion in estimate_path_cost_size(). |
Date: | 2021-02-05 06:35:43 |
Message-ID: | E1l7uiV-0004oT-DU@gemulon.postgresql.org |
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Lists: | pgsql-committers |
postgres_fdw: Fix assertion in estimate_path_cost_size().
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
Branch
------
REL_13_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/984384129bb8a92481d4f7ddd5dede2d781b191f
Modified Files
--------------
contrib/postgres_fdw/expected/postgres_fdw.out | 18 ++++++++++++++++++
contrib/postgres_fdw/postgres_fdw.c | 2 +-
contrib/postgres_fdw/sql/postgres_fdw.sql | 12 ++++++++++++
3 files changed, 31 insertions(+), 1 deletion(-)
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