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doc: clearify trigger behavior for inheritance 

The previous wording added in PG 10 wasn't specific enough about the
behavior of statement and row triggers when using inheritance.

Reported-by: ian@thepathcentral.com

Discussion: https://postgr.es/m/20171129193934.27108.30796@wrigleys.postgresql.org

Backpatch-through: 10
This commit is contained in:
Bruce Momjian 2018-01-31 17:00:17 -05:00
parent 3b15255912
commit 1cf1112990
1 changed files with 3 additions and 2 deletions
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5
doc/src/sgml/ref/create_trigger.sgml
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@ -501,9 +501,10 @@ UPDATE OF <replaceable>column_name1</replaceable> [, <replaceable>column_name2</
<para>
Modifying a partitioned table or a table with inheritance children fires
statement-level triggers directly attached to that table, but not
statement-level triggers attached to the explicitly named table, but not
statement-level triggers for its partitions or child tables. In contrast,
row-level triggers are fired for all affected partitions or child tables.
row-level triggers are fired on the rows in effected partitions or
child tables, even if they are not explicitly named in the query.
If a statement-level trigger has been defined with transition relations
named by a <literal>REFERENCING</literal> clause, then before and after
images of rows are visible from all affected partitions or child tables.