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Add support for INSERT ... ON CONFLICT DO NOTHING/UPDATE.

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The newly added ON CONFLICT clause allows to specify an alternative to
raising a unique or exclusion constraint violation error when inserting.
ON CONFLICT refers to constraints that can either be specified using a
inference clause (by specifying the columns of a unique constraint) or
by naming a unique or exclusion constraint.  DO NOTHING avoids the
constraint violation, without touching the pre-existing row.  DO UPDATE
SET ... [WHERE ...] updates the pre-existing tuple, and has access to
both the tuple proposed for insertion and the existing tuple; the
optional WHERE clause can be used to prevent an update from being
executed.  The UPDATE SET and WHERE clauses have access to the tuple
proposed for insertion using the "magic" EXCLUDED alias, and to the
pre-existing tuple using the table name or its alias.

This feature is often referred to as upsert.

This is implemented using a new infrastructure called "speculative
insertion". It is an optimistic variant of regular insertion that first
does a pre-check for existing tuples and then attempts an insert.  If a
violating tuple was inserted concurrently, the speculatively inserted
tuple is deleted and a new attempt is made.  If the pre-check finds a
matching tuple the alternative DO NOTHING or DO UPDATE action is taken.
If the insertion succeeds without detecting a conflict, the tuple is
deemed inserted.

To handle the possible ambiguity between the excluded alias and a table
named excluded, and for convenience with long relation names, INSERT
INTO now can alias its target table.

Bumps catversion as stored rules change.

Author: Peter Geoghegan, with significant contributions from Heikki
    Linnakangas and Andres Freund. Testing infrastructure by Jeff Janes.
Reviewed-By: Heikki Linnakangas, Andres Freund, Robert Haas, Simon Riggs,
    Dean Rasheed, Stephen Frost and many others.
This commit is contained in:
Andres Freund
2015-05-08 05:31:36 +02:00
parent 2c8f4836db
commit 168d5805e4
122 changed files with 6111 additions and 440 deletions
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9
contrib/test_decoding/expected/toast.out
View File

@ -23,6 +23,10 @@ INSERT INTO xpto (toasted_col2) SELECT repeat(string_agg(to_char(g.i, 'FM0000'),
-- update of existing column
UPDATE xpto SET toasted_col1 = (SELECT string_agg(g.i::text, '') FROM generate_series(1, 2000) g(i)) WHERE id = 1;
UPDATE xpto SET rand1 = 123.456 WHERE id = 1;
-- updating external via INSERT ... ON CONFLICT DO UPDATE
INSERT INTO xpto(id, toasted_col2) VALUES (2, 'toasted2-upsert')
ON CONFLICT (id)
DO UPDATE SET toasted_col2 = EXCLUDED.toasted_col2 || xpto.toasted_col2;
DELETE FROM xpto WHERE id = 1;
DROP TABLE IF EXISTS toasted_key;
NOTICE: table "toasted_key" does not exist, skipping
@ -64,6 +68,9 @@ SELECT substr(data, 1, 200) FROM pg_logical_slot_get_changes('regression_slot',
table public.xpto: UPDATE: id[integer]:1 toasted_col1[text]:unchanged-toast-datum rand1[double precision]:123.456 toasted_col2[text]:unchanged-toast-datum rand2[double precision]:1578
COMMIT
BEGIN
table public.xpto: UPDATE: id[integer]:2 toasted_col1[text]:null rand1[double precision]:3077 toasted_col2[text]:'toasted2-upsert00010002000300040005000600070008000900100011001200130014001500160017001
COMMIT
BEGIN
table public.xpto: DELETE: id[integer]:1
COMMIT
BEGIN
@ -283,7 +290,7 @@ SELECT substr(data, 1, 200) FROM pg_logical_slot_get_changes('regression_slot',
table public.toasted_copy: INSERT: id[integer]:202 data[text]:'untoasted199'
table public.toasted_copy: INSERT: id[integer]:203 data[text]:'untoasted200'
COMMIT
(232 rows)
(235 rows)
SELECT pg_drop_replication_slot('regression_slot');
pg_drop_replication_slot