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postgres_fdw: Fix cache lookup failure while creating error context.

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This is fallout from join pushdown; get_relid_attribute_name can't
handle an attribute number of 0, indicating a whole-row reference,
and shouldn't be called in that case.

Etsuro Fujita, reviewed by Ashutosh Bapat
This commit is contained in:
Robert Haas
2016-07-01 11:29:25 -04:00
parent 5f3499b2b5
commit 86437ddf8c
3 changed files with 18 additions and 3 deletions
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contrib/postgres_fdw/sql/postgres_fdw.sql
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@ -627,6 +627,7 @@ DROP FUNCTION f_test(int);
ALTER FOREIGN TABLE ft1 ALTER COLUMN c8 TYPE int;
SELECT * FROM ft1 WHERE c1 = 1; -- ERROR
SELECT ft1.c1, ft2.c2, ft1.c8 FROM ft1, ft2 WHERE ft1.c1 = ft2.c1 AND ft1.c1 = 1; -- ERROR
SELECT ft1.c1, ft2.c2, ft1 FROM ft1, ft2 WHERE ft1.c1 = ft2.c1 AND ft1.c1 = 1; -- ERROR
ALTER FOREIGN TABLE ft1 ALTER COLUMN c8 TYPE user_enum;
-- ===================================================================