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Add tg_updatedcols to TriggerData

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This allows a trigger function to determine for an UPDATE trigger
which columns were actually updated.  This allows some optimizations
in generic trigger functions such as lo_manage and
tsvector_update_trigger.

Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Discussion: https://www.postgresql.org/message-id/flat/11c5f156-67a9-0fb5-8200-2a8018eb2e0c@2ndquadrant.com
This commit is contained in:
Peter Eisentraut
2020-03-09 09:22:22 +01:00
parent 8f152b6c50
commit 71d60e2aa0
7 changed files with 68 additions and 9 deletions
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5
contrib/lo/sql/lo.sql
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@ -18,6 +18,11 @@ UPDATE image SET raster = 43214 WHERE title = 'beautiful image';
SELECT lo_get(43213);
SELECT lo_get(43214);
-- test updating of unrelated column
UPDATE image SET title = 'beautiful picture' WHERE title = 'beautiful image';
SELECT lo_get(43214);
DELETE FROM image;
SELECT lo_get(43214);