postgres_fdw: Disable batch insertion when there are WCO constraints.
When inserting a view referencing a foreign table that has WITH CHECK
OPTION constraints, in single-insert mode postgres_fdw retrieves the
data that was actually inserted on the remote side so that the WITH
CHECK OPTION constraints are enforced with the data locally, but in
batch-insert mode it cannot currently retrieve the data (except for the
row first inserted through the view), resulting in enforcing the WITH
CHECK OPTION constraints with the data passed from the core (except for
the first-inserted row), which led to incorrect results when inserting
into a view referencing a foreign table in which a remote BEFORE ROW
INSERT trigger changes the rows inserted through the view so that they
violate the view's WITH CHECK OPTION constraint. Also, the query
inserting into the view caused an assertion failure in assert-enabled
builds.
Fix these by disabling batch insertion when inserting into such a view.
Back-patch to v14 where batch insertion was added.
Discussion: https://postgr.es/m/CAPmGK17LpbTZs4m4a_6THP54UBeK9fHvX8aVVA%2BC6yEZDZwQcg%40mail.gmail.com
Branch
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REL_14_STABLE
Details
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https://git.postgresql.org/pg/commitdiff/4a9bc2e0f5226d29e7e11c9611b8649a4aa74a4b
Modified Files
--------------
contrib/postgres_fdw/expected/postgres_fdw.out | 44 ++++++++++++++++++++++++++
contrib/postgres_fdw/postgres_fdw.c | 6 ++--
contrib/postgres_fdw/sql/postgres_fdw.sql | 16 ++++++++++
3 files changed, 64 insertions(+), 2 deletions(-)
