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Allow UPDATE to move rows between partitions.

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When an UPDATE causes a row to no longer match the partition
constraint, try to move it to a different partition where it does
match the partition constraint.  In essence, the UPDATE is split into
a DELETE from the old partition and an INSERT into the new one.  This
can lead to surprising behavior in concurrency scenarios because
EvalPlanQual rechecks won't work as they normally did; the known
problems are documented.  (There is a pending patch to improve the
situation further, but it needs more review.)

Amit Khandekar, reviewed and tested by Amit Langote, David Rowley,
Rajkumar Raghuwanshi, Dilip Kumar, Amul Sul, Thomas Munro, Álvaro
Herrera, Amit Kapila, and me.  A few final revisions by me.

Discussion: http://postgr.es/m/CAJ3gD9do9o2ccQ7j7+tSgiE1REY65XRiMb=yJO3u3QhyP8EEPQ@mail.gmail.com
This commit is contained in:
Robert Haas
2018-01-19 15:33:06 -05:00
parent 7f17fd6fc7
commit 2f17844104
27 changed files with 1959 additions and 276 deletions
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1
contrib/file_fdw/input/file_fdw.source
View File

@ -178,6 +178,7 @@ SELECT tableoid::regclass, * FROM p1;
SELECT tableoid::regclass, * FROM p2;
INSERT INTO pt VALUES (1, 'xyzzy'); -- ERROR
INSERT INTO pt VALUES (2, 'xyzzy');
UPDATE pt set a = 1 where a = 2; -- ERROR
SELECT tableoid::regclass, * FROM pt;
SELECT tableoid::regclass, * FROM p1;
SELECT tableoid::regclass, * FROM p2;

2
contrib/file_fdw/output/file_fdw.source
View File

@ -344,6 +344,8 @@ SELECT tableoid::regclass, * FROM p2;
INSERT INTO pt VALUES (1, 'xyzzy'); -- ERROR
ERROR: cannot route inserted tuples to a foreign table
INSERT INTO pt VALUES (2, 'xyzzy');
UPDATE pt set a = 1 where a = 2; -- ERROR
ERROR: cannot route inserted tuples to a foreign table
SELECT tableoid::regclass, * FROM pt;
tableoid | a | b
----------+---+-------