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Allow FOR EACH ROW triggers on partitioned tables

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Previously, FOR EACH ROW triggers were not allowed in partitioned
tables.  Now we allow AFTER triggers on them, and on trigger creation we
cascade to create an identical trigger in each partition.  We also clone
the triggers to each partition that is created or attached later.

This means that deferred unique keys are allowed on partitioned tables,
too.

Author: Álvaro Herrera
Reviewed-by: Peter Eisentraut, Simon Riggs, Amit Langote, Robert Haas,
	Thomas Munro
Discussion: https://postgr.es/m/20171229225319.ajltgss2ojkfd3kp@alvherre.pgsql
This commit is contained in:
Alvaro Herrera
2018-03-23 10:48:22 -03:00
parent 5700aa1301
commit 86f575948c
20 changed files with 1078 additions and 93 deletions
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8
doc/src/sgml/catalogs.sgml
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@ -2254,6 +2254,14 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
key, foreign key, or exclusion constraint; else 0</entry>
</row>
<row>
<entry><structfield>conparentid</structfield></entry>
<entry><type>oid</type></entry>
<entry><literal><link linkend="catalog-pg-constraint"><structname>pg_constraint</structname></link>.oid</literal></entry>
<entry>The corresponding constraint in the parent partitioned table,
if this is a constraint in a partition; else 0</entry>
</row>
<row>
<entry><structfield>confrelid</structfield></entry>
<entry><type>oid</type></entry>

7
doc/src/sgml/ref/create_trigger.sgml
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@ -512,6 +512,13 @@ UPDATE OF <replaceable>column_name1</replaceable> [, <replaceable>column_name2</
the ones that are fired.
</para>
<para>
Creating a row-level trigger on a partitioned table will cause identical
triggers to be created in all its existing partitions; and any partitions
created or attached later will contain an identical trigger, too.
Triggers on partitioned tables may only be <literal>AFTER</literal>.
</para>
<para>
Modifying a partitioned table or a table with inheritance children fires
statement-level triggers attached to the explicitly named table, but not