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Fix null-pointer crash in postgres_fdw's conversion_error_callback.

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Commit c7b7311f6 adjusted conversion_error_callback to always use
information from the query's rangetable, to avoid doing catalog lookups
in an already-failed transaction.  However, as a result of the utterly
inadequate documentation for make_tuple_from_result_row, I failed to
realize that fsstate could be NULL in some contexts.  That led to a
crash if we got a conversion error in such a context.  Fix by falling
back to the previous coding when fsstate is NULL.  Improve the
commentary, too.

Per report from Andrey Borodin.  Back-patch to 9.6, like the previous
patch.

Discussion: https://postgr.es/m/08916396-55E4-4D68-AB3A-BD6066F9E5C0@yandex-team.ru
This commit is contained in:
Tom Lane
2021-10-06 15:50:24 -04:00
parent 8e26b868d5
commit 12ff678e1d
3 changed files with 78 additions and 36 deletions
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contrib/postgres_fdw/expected/postgres_fdw.out
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@ -4110,6 +4110,9 @@ CONTEXT: whole-row reference to foreign table "ftx"
SELECT sum(c2), array_agg(c8) FROM ft1 GROUP BY c8; -- ERROR
ERROR: invalid input syntax for type integer: "foo"
CONTEXT: processing expression at position 2 in select list
ANALYZE ft1; -- ERROR
ERROR: invalid input syntax for type integer: "foo"
CONTEXT: column "c8" of foreign table "ft1"
ALTER FOREIGN TABLE ft1 ALTER COLUMN c8 TYPE user_enum;
-- ===================================================================
-- subtransaction