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Don't throw serialization errors for self-conflicts in INSERT ON CONFLICT.

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A transaction that conflicts against itself, for example
	INSERT INTO t(pk) VALUES (1),(1) ON CONFLICT DO NOTHING;
should behave the same regardless of isolation level.  It certainly
shouldn't throw a serialization error, as retrying will not help.
We got this wrong due to the ON CONFLICT logic not considering the case,
as reported by Jason Dusek.

Core of this patch is by Peter Geoghegan (based on an earlier patch by
Thomas Munro), though I didn't take his proposed code refactoring for fear
that it might have unexpected side-effects.  Test cases by Thomas Munro
and myself.

Report: <CAO3NbwOycQjt2Oqy2VW-eLTq2M5uGMyHnGm=RNga4mjqcYD7gQ@mail.gmail.com>
Related-Discussion: <57EE93C8.8080504@postgrespro.ru>
This commit is contained in:
Tom Lane
2016-10-23 18:36:13 -04:00
parent 6292c23391
commit a6c0a5b6e8
6 changed files with 218 additions and 2 deletions
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34
src/test/isolation/specs/insert-conflict-do-nothing-2.spec Normal file
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# INSERT...ON CONFLICT DO NOTHING test with multiple rows
# in higher isolation levels
setup
{
CREATE TABLE ints (key int primary key, val text);
}
teardown
{
DROP TABLE ints;
}
session "s1"
step "beginrr1" { BEGIN ISOLATION LEVEL REPEATABLE READ; }
step "begins1" { BEGIN ISOLATION LEVEL SERIALIZABLE; }
step "donothing1" { INSERT INTO ints(key, val) VALUES(1, 'donothing1') ON CONFLICT DO NOTHING; }
step "c1" { COMMIT; }
step "show" { SELECT * FROM ints; }
session "s2"
step "beginrr2" { BEGIN ISOLATION LEVEL REPEATABLE READ; }
step "begins2" { BEGIN ISOLATION LEVEL SERIALIZABLE; }
step "donothing2" { INSERT INTO ints(key, val) VALUES(1, 'donothing2'), (1, 'donothing3') ON CONFLICT DO NOTHING; }
step "c2" { COMMIT; }
permutation "beginrr1" "beginrr2" "donothing1" "c1" "donothing2" "c2" "show"
permutation "beginrr1" "beginrr2" "donothing2" "c2" "donothing1" "c1" "show"
permutation "beginrr1" "beginrr2" "donothing1" "donothing2" "c1" "c2" "show"
permutation "beginrr1" "beginrr2" "donothing2" "donothing1" "c2" "c1" "show"
permutation "begins1" "begins2" "donothing1" "c1" "donothing2" "c2" "show"
permutation "begins1" "begins2" "donothing2" "c2" "donothing1" "c1" "show"
permutation "begins1" "begins2" "donothing1" "donothing2" "c1" "c2" "show"
permutation "begins1" "begins2" "donothing2" "donothing1" "c2" "c1" "show"