<para>
A trigger is a specification that the database should automatically
execute a particular function whenever a certain type of operation is
- performed. Triggers can be attached to tables, views, and foreign tables.
+ performed. Triggers can be attached to tables (partitioned or not),
+ views, and foreign tables.
</para>
<para>
Statement-level <literal>BEFORE</> triggers naturally fire before the
statement starts to do anything, while statement-level <literal>AFTER</>
triggers fire at the very end of the statement. These types of
- triggers may be defined on tables or views. Row-level <literal>BEFORE</>
- triggers fire immediately before a particular row is operated on,
- while row-level <literal>AFTER</> triggers fire at the end of the
- statement (but before any statement-level <literal>AFTER</> triggers).
- These types of triggers may only be defined on tables and foreign tables.
- Row-level <literal>INSTEAD OF</> triggers may only be defined on views,
- and fire immediately as each row in the view is identified as needing to
- be operated on.
+ triggers may be defined on tables, views, or foreign tables. Row-level
+ <literal>BEFORE</> triggers fire immediately before a particular row is
+ operated on, while row-level <literal>AFTER</> triggers fire at the end of
+ the statement (but before any statement-level <literal>AFTER</> triggers).
+ These types of triggers may only be defined on non-partitioned tables and
+ foreign tables. Row-level <literal>INSTEAD OF</> triggers may only be
+ defined on views, and fire immediately as each row in the view is
+ identified as needing to be operated on.
</para>
<para>
/*
* In the partitioned result relation case, lock the non-leaf result
- * relations too. We don't however need ResultRelInfos for them.
+ * relations too. A subset of these are the roots of respective
+ * partitioned tables, for which we also allocate ResulRelInfos.
*/
+ estate->es_root_result_relations = NULL;
+ estate->es_num_root_result_relations = 0;
if (plannedstmt->nonleafResultRelations)
{
+ int num_roots = list_length(plannedstmt->rootResultRelations);
+
+ /*
+ * Firstly, build ResultRelInfos for all the partitioned table
+ * roots, because we will need them to fire the statement-level
+ * triggers, if any.
+ */
+ resultRelInfos = (ResultRelInfo *)
+ palloc(num_roots * sizeof(ResultRelInfo));
+ resultRelInfo = resultRelInfos;
+ foreach(l, plannedstmt->rootResultRelations)
+ {
+ Index resultRelIndex = lfirst_int(l);
+ Oid resultRelOid;
+ Relation resultRelDesc;
+
+ resultRelOid = getrelid(resultRelIndex, rangeTable);
+ resultRelDesc = heap_open(resultRelOid, RowExclusiveLock);
+ InitResultRelInfo(resultRelInfo,
+ resultRelDesc,
+ lfirst_int(l),
+ NULL,
+ estate->es_instrument);
+ resultRelInfo++;
+ }
+
+ estate->es_root_result_relations = resultRelInfos;
+ estate->es_num_root_result_relations = num_roots;
+
+ /* Simply lock the rest of them. */
foreach(l, plannedstmt->nonleafResultRelations)
{
- Index resultRelationIndex = lfirst_int(l);
- Oid resultRelationOid;
+ Index resultRelIndex = lfirst_int(l);
- resultRelationOid = getrelid(resultRelationIndex, rangeTable);
- LockRelationOid(resultRelationOid, RowExclusiveLock);
+ /* We locked the roots above. */
+ if (!list_member_int(plannedstmt->rootResultRelations,
+ resultRelIndex))
+ LockRelationOid(getrelid(resultRelIndex, rangeTable),
+ RowExclusiveLock);
}
}
}
estate->es_result_relations = NULL;
estate->es_num_result_relations = 0;
estate->es_result_relation_info = NULL;
+ estate->es_root_result_relations = NULL;
+ estate->es_num_root_result_relations = 0;
}
/*
resultRelInfo++;
}
+ /* Close the root target relation(s). */
+ resultRelInfo = estate->es_root_result_relations;
+ for (i = estate->es_num_root_result_relations; i > 0; i--)
+ {
+ heap_close(resultRelInfo->ri_RelationDesc, NoLock);
+ resultRelInfo++;
+ }
+
/*
* likewise close any trigger target relations
*/
static void
fireBSTriggers(ModifyTableState *node)
{
+ ResultRelInfo *resultRelInfo = node->resultRelInfo;
+
+ /*
+ * If the node modifies a partitioned table, we must fire its triggers.
+ * Note that in that case, node->resultRelInfo points to the first leaf
+ * partition, not the root table.
+ */
+ if (node->rootResultRelInfo != NULL)
+ resultRelInfo = node->rootResultRelInfo;
+
switch (node->operation)
{
case CMD_INSERT:
- ExecBSInsertTriggers(node->ps.state, node->resultRelInfo);
+ ExecBSInsertTriggers(node->ps.state, resultRelInfo);
if (node->mt_onconflict == ONCONFLICT_UPDATE)
ExecBSUpdateTriggers(node->ps.state,
- node->resultRelInfo);
+ resultRelInfo);
break;
case CMD_UPDATE:
- ExecBSUpdateTriggers(node->ps.state, node->resultRelInfo);
+ ExecBSUpdateTriggers(node->ps.state, resultRelInfo);
break;
case CMD_DELETE:
- ExecBSDeleteTriggers(node->ps.state, node->resultRelInfo);
+ ExecBSDeleteTriggers(node->ps.state, resultRelInfo);
break;
default:
elog(ERROR, "unknown operation");
static void
fireASTriggers(ModifyTableState *node)
{
+ ResultRelInfo *resultRelInfo = node->resultRelInfo;
+
+ /*
+ * If the node modifies a partitioned table, we must fire its triggers.
+ * Note that in that case, node->resultRelInfo points to the first leaf
+ * partition, not the root table.
+ */
+ if (node->rootResultRelInfo != NULL)
+ resultRelInfo = node->rootResultRelInfo;
+
switch (node->operation)
{
case CMD_INSERT:
if (node->mt_onconflict == ONCONFLICT_UPDATE)
ExecASUpdateTriggers(node->ps.state,
- node->resultRelInfo);
- ExecASInsertTriggers(node->ps.state, node->resultRelInfo);
+ resultRelInfo);
+ ExecASInsertTriggers(node->ps.state, resultRelInfo);
break;
case CMD_UPDATE:
- ExecASUpdateTriggers(node->ps.state, node->resultRelInfo);
+ ExecASUpdateTriggers(node->ps.state, resultRelInfo);
break;
case CMD_DELETE:
- ExecASDeleteTriggers(node->ps.state, node->resultRelInfo);
+ ExecASDeleteTriggers(node->ps.state, resultRelInfo);
break;
default:
elog(ERROR, "unknown operation");
mtstate->mt_plans = (PlanState **) palloc0(sizeof(PlanState *) * nplans);
mtstate->resultRelInfo = estate->es_result_relations + node->resultRelIndex;
+
+ /* If modifying a partitioned table, initialize the root table info */
+ if (node->rootResultRelIndex >= 0)
+ mtstate->rootResultRelInfo = estate->es_root_result_relations +
+ node->rootResultRelIndex;
+
mtstate->mt_arowmarks = (List **) palloc0(sizeof(List *) * nplans);
mtstate->mt_nplans = nplans;
mtstate->mt_onconflict = node->onConflictAction;
COPY_NODE_FIELD(rtable);
COPY_NODE_FIELD(resultRelations);
COPY_NODE_FIELD(nonleafResultRelations);
+ COPY_NODE_FIELD(rootResultRelations);
COPY_NODE_FIELD(subplans);
COPY_BITMAPSET_FIELD(rewindPlanIDs);
COPY_NODE_FIELD(rowMarks);
COPY_NODE_FIELD(partitioned_rels);
COPY_NODE_FIELD(resultRelations);
COPY_SCALAR_FIELD(resultRelIndex);
+ COPY_SCALAR_FIELD(rootResultRelIndex);
COPY_NODE_FIELD(plans);
COPY_NODE_FIELD(withCheckOptionLists);
COPY_NODE_FIELD(returningLists);
WRITE_NODE_FIELD(rtable);
WRITE_NODE_FIELD(resultRelations);
WRITE_NODE_FIELD(nonleafResultRelations);
+ WRITE_NODE_FIELD(rootResultRelations);
WRITE_NODE_FIELD(subplans);
WRITE_BITMAPSET_FIELD(rewindPlanIDs);
WRITE_NODE_FIELD(rowMarks);
WRITE_NODE_FIELD(partitioned_rels);
WRITE_NODE_FIELD(resultRelations);
WRITE_INT_FIELD(resultRelIndex);
+ WRITE_INT_FIELD(rootResultRelIndex);
WRITE_NODE_FIELD(plans);
WRITE_NODE_FIELD(withCheckOptionLists);
WRITE_NODE_FIELD(returningLists);
WRITE_NODE_FIELD(finalrowmarks);
WRITE_NODE_FIELD(resultRelations);
WRITE_NODE_FIELD(nonleafResultRelations);
+ WRITE_NODE_FIELD(rootResultRelations);
WRITE_NODE_FIELD(relationOids);
WRITE_NODE_FIELD(invalItems);
WRITE_INT_FIELD(nParamExec);
READ_NODE_FIELD(rtable);
READ_NODE_FIELD(resultRelations);
READ_NODE_FIELD(nonleafResultRelations);
+ READ_NODE_FIELD(rootResultRelations);
READ_NODE_FIELD(subplans);
READ_BITMAPSET_FIELD(rewindPlanIDs);
READ_NODE_FIELD(rowMarks);
READ_NODE_FIELD(partitioned_rels);
READ_NODE_FIELD(resultRelations);
READ_INT_FIELD(resultRelIndex);
+ READ_INT_FIELD(rootResultRelIndex);
READ_NODE_FIELD(plans);
READ_NODE_FIELD(withCheckOptionLists);
READ_NODE_FIELD(returningLists);
node->partitioned_rels = partitioned_rels;
node->resultRelations = resultRelations;
node->resultRelIndex = -1; /* will be set correctly in setrefs.c */
+ node->rootResultRelIndex = -1; /* will be set correctly in setrefs.c */
node->plans = subplans;
if (!onconflict)
{
glob->finalrowmarks = NIL;
glob->resultRelations = NIL;
glob->nonleafResultRelations = NIL;
+ glob->rootResultRelations = NIL;
glob->relationOids = NIL;
glob->invalItems = NIL;
glob->nParamExec = 0;
Assert(glob->finalrowmarks == NIL);
Assert(glob->resultRelations == NIL);
Assert(glob->nonleafResultRelations == NIL);
+ Assert(glob->rootResultRelations == NIL);
top_plan = set_plan_references(root, top_plan);
/* ... and the subplans (both regular subplans and initplans) */
Assert(list_length(glob->subplans) == list_length(glob->subroots));
result->rtable = glob->finalrtable;
result->resultRelations = glob->resultRelations;
result->nonleafResultRelations = glob->nonleafResultRelations;
+ result->rootResultRelations = glob->rootResultRelations;
result->subplans = glob->subplans;
result->rewindPlanIDs = glob->rewindPlanIDs;
result->rowMarks = glob->finalrowmarks;
/*
* If the main target relation is a partitioned table, the
* following list contains the RT indexes of partitioned child
- * relations, which are not included in the above list.
+ * relations including the root, which are not included in the
+ * above list. We also keep RT indexes of the roots separately
+ * to be identitied as such during the executor initialization.
*/
- root->glob->nonleafResultRelations =
- list_concat(root->glob->nonleafResultRelations,
- list_copy(splan->partitioned_rels));
+ if (splan->partitioned_rels != NIL)
+ {
+ root->glob->nonleafResultRelations =
+ list_concat(root->glob->nonleafResultRelations,
+ list_copy(splan->partitioned_rels));
+ /* Remember where this root will be in the global list. */
+ splan->rootResultRelIndex =
+ list_length(root->glob->rootResultRelations);
+ root->glob->rootResultRelations =
+ lappend_int(root->glob->rootResultRelations,
+ linitial_int(splan->partitioned_rels));
+ }
}
break;
case T_Append:
int es_num_result_relations; /* length of array */
ResultRelInfo *es_result_relation_info; /* currently active array elt */
+ /*
+ * Info about the target partitioned target table root(s) for
+ * update/delete queries. They required only to fire any per-statement
+ * triggers defined on the table. It exists separately from
+ * es_result_relations, because partitioned tables don't appear in the
+ * plan tree for the update/delete cases.
+ */
+ ResultRelInfo *es_root_result_relations; /* array of ResultRelInfos */
+ int es_num_root_result_relations; /* length of the array */
+
/* Stuff used for firing triggers: */
List *es_trig_target_relations; /* trigger-only ResultRelInfos */
TupleTableSlot *es_trig_tuple_slot; /* for trigger output tuples */
int mt_nplans; /* number of plans in the array */
int mt_whichplan; /* which one is being executed (0..n-1) */
ResultRelInfo *resultRelInfo; /* per-subplan target relations */
+ ResultRelInfo *rootResultRelInfo; /* root target relation (partitioned
+ * table root) */
List **mt_arowmarks; /* per-subplan ExecAuxRowMark lists */
EPQState mt_epqstate; /* for evaluating EvalPlanQual rechecks */
bool fireBSTriggers; /* do we need to fire stmt triggers? */
/* rtable indexes of target relations for INSERT/UPDATE/DELETE */
List *resultRelations; /* integer list of RT indexes, or NIL */
- /* rtable indexes of non-leaf target relations for INSERT/UPDATE/DELETE */
+ /*
+ * rtable indexes of non-leaf target relations for UPDATE/DELETE on
+ * all the partitioned table mentioned in the query.
+ */
List *nonleafResultRelations;
+ /*
+ * rtable indexes of root target relations for UPDATE/DELETE; this list
+ * maintains a subset of the RT indexes in nonleafResultRelations,
+ * indicating the roots of the respective partition hierarchies.
+ */
+ List *rootResultRelations;
+
List *subplans; /* Plan trees for SubPlan expressions; note
* that some could be NULL */
List *partitioned_rels;
List *resultRelations; /* integer list of RT indexes */
int resultRelIndex; /* index of first resultRel in plan's list */
+ int rootResultRelIndex; /* index of the partitioned table root */
List *plans; /* plan(s) producing source data */
List *withCheckOptionLists; /* per-target-table WCO lists */
List *returningLists; /* per-target-table RETURNING tlists */
List *resultRelations; /* "flat" list of integer RT indexes */
List *nonleafResultRelations; /* "flat" list of integer RT indexes */
+ List *rootResultRelations; /* "flat" list of integer RT indexes */
List *relationOids; /* OIDs of relations the plan depends on */
drop trigger my_trigger on my_table_42;
drop table my_table_42;
drop table my_table;
+--
+-- Verify that per-statement triggers are fired for partitioned tables
+--
+create table parted_stmt_trig (a int) partition by list (a);
+create table parted_stmt_trig1 partition of parted_stmt_trig for values in (1);
+create table parted_stmt_trig2 partition of parted_stmt_trig for values in (2);
+create table parted2_stmt_trig (a int) partition by list (a);
+create table parted2_stmt_trig1 partition of parted2_stmt_trig for values in (1);
+create table parted2_stmt_trig2 partition of parted2_stmt_trig for values in (2);
+create or replace function trigger_notice() returns trigger as $$
+ begin
+ raise notice 'trigger on % % % for %', TG_TABLE_NAME, TG_WHEN, TG_OP, TG_LEVEL;
+ if TG_LEVEL = 'ROW' then
+ return NEW;
+ end if;
+ return null;
+ end;
+ $$ language plpgsql;
+-- insert/update/delete statment-level triggers on the parent
+create trigger trig_ins_before before insert on parted_stmt_trig
+ for each statement execute procedure trigger_notice();
+create trigger trig_ins_after after insert on parted_stmt_trig
+ for each statement execute procedure trigger_notice();
+create trigger trig_upd_before before update on parted_stmt_trig
+ for each statement execute procedure trigger_notice();
+create trigger trig_upd_after after update on parted_stmt_trig
+ for each statement execute procedure trigger_notice();
+create trigger trig_del_before before delete on parted_stmt_trig
+ for each statement execute procedure trigger_notice();
+create trigger trig_del_after after delete on parted_stmt_trig
+ for each statement execute procedure trigger_notice();
+-- insert/update/delete row-level triggers on the first partition
+create trigger trig_ins_before before insert on parted_stmt_trig1
+ for each row execute procedure trigger_notice();
+create trigger trig_ins_after after insert on parted_stmt_trig1
+ for each row execute procedure trigger_notice();
+create trigger trig_upd_before before update on parted_stmt_trig1
+ for each row execute procedure trigger_notice();
+create trigger trig_upd_after after update on parted_stmt_trig1
+ for each row execute procedure trigger_notice();
+-- insert/update/delete statement-level triggers on the parent
+create trigger trig_ins_before before insert on parted2_stmt_trig
+ for each statement execute procedure trigger_notice();
+create trigger trig_ins_after after insert on parted2_stmt_trig
+ for each statement execute procedure trigger_notice();
+create trigger trig_upd_before before update on parted2_stmt_trig
+ for each statement execute procedure trigger_notice();
+create trigger trig_upd_after after update on parted2_stmt_trig
+ for each statement execute procedure trigger_notice();
+create trigger trig_del_before before delete on parted2_stmt_trig
+ for each statement execute procedure trigger_notice();
+create trigger trig_del_after after delete on parted2_stmt_trig
+ for each statement execute procedure trigger_notice();
+with ins (a) as (
+ insert into parted2_stmt_trig values (1), (2) returning a
+) insert into parted_stmt_trig select a from ins returning tableoid::regclass, a;
+NOTICE: trigger on parted_stmt_trig BEFORE INSERT for STATEMENT
+NOTICE: trigger on parted2_stmt_trig BEFORE INSERT for STATEMENT
+NOTICE: trigger on parted_stmt_trig1 BEFORE INSERT for ROW
+NOTICE: trigger on parted_stmt_trig1 AFTER INSERT for ROW
+NOTICE: trigger on parted2_stmt_trig AFTER INSERT for STATEMENT
+NOTICE: trigger on parted_stmt_trig AFTER INSERT for STATEMENT
+ tableoid | a
+-------------------+---
+ parted_stmt_trig1 | 1
+ parted_stmt_trig2 | 2
+(2 rows)
+
+with upd as (
+ update parted2_stmt_trig set a = a
+) update parted_stmt_trig set a = a;
+NOTICE: trigger on parted_stmt_trig BEFORE UPDATE for STATEMENT
+NOTICE: trigger on parted_stmt_trig1 BEFORE UPDATE for ROW
+NOTICE: trigger on parted2_stmt_trig BEFORE UPDATE for STATEMENT
+NOTICE: trigger on parted_stmt_trig1 AFTER UPDATE for ROW
+NOTICE: trigger on parted_stmt_trig AFTER UPDATE for STATEMENT
+NOTICE: trigger on parted2_stmt_trig AFTER UPDATE for STATEMENT
+delete from parted_stmt_trig;
+NOTICE: trigger on parted_stmt_trig BEFORE DELETE for STATEMENT
+NOTICE: trigger on parted_stmt_trig AFTER DELETE for STATEMENT
+drop table parted_stmt_trig, parted2_stmt_trig;
drop trigger my_trigger on my_table_42;
drop table my_table_42;
drop table my_table;
+
+--
+-- Verify that per-statement triggers are fired for partitioned tables
+--
+create table parted_stmt_trig (a int) partition by list (a);
+create table parted_stmt_trig1 partition of parted_stmt_trig for values in (1);
+create table parted_stmt_trig2 partition of parted_stmt_trig for values in (2);
+
+create table parted2_stmt_trig (a int) partition by list (a);
+create table parted2_stmt_trig1 partition of parted2_stmt_trig for values in (1);
+create table parted2_stmt_trig2 partition of parted2_stmt_trig for values in (2);
+
+create or replace function trigger_notice() returns trigger as $$
+ begin
+ raise notice 'trigger on % % % for %', TG_TABLE_NAME, TG_WHEN, TG_OP, TG_LEVEL;
+ if TG_LEVEL = 'ROW' then
+ return NEW;
+ end if;
+ return null;
+ end;
+ $$ language plpgsql;
+
+-- insert/update/delete statment-level triggers on the parent
+create trigger trig_ins_before before insert on parted_stmt_trig
+ for each statement execute procedure trigger_notice();
+create trigger trig_ins_after after insert on parted_stmt_trig
+ for each statement execute procedure trigger_notice();
+create trigger trig_upd_before before update on parted_stmt_trig
+ for each statement execute procedure trigger_notice();
+create trigger trig_upd_after after update on parted_stmt_trig
+ for each statement execute procedure trigger_notice();
+create trigger trig_del_before before delete on parted_stmt_trig
+ for each statement execute procedure trigger_notice();
+create trigger trig_del_after after delete on parted_stmt_trig
+ for each statement execute procedure trigger_notice();
+
+-- insert/update/delete row-level triggers on the first partition
+create trigger trig_ins_before before insert on parted_stmt_trig1
+ for each row execute procedure trigger_notice();
+create trigger trig_ins_after after insert on parted_stmt_trig1
+ for each row execute procedure trigger_notice();
+create trigger trig_upd_before before update on parted_stmt_trig1
+ for each row execute procedure trigger_notice();
+create trigger trig_upd_after after update on parted_stmt_trig1
+ for each row execute procedure trigger_notice();
+
+-- insert/update/delete statement-level triggers on the parent
+create trigger trig_ins_before before insert on parted2_stmt_trig
+ for each statement execute procedure trigger_notice();
+create trigger trig_ins_after after insert on parted2_stmt_trig
+ for each statement execute procedure trigger_notice();
+create trigger trig_upd_before before update on parted2_stmt_trig
+ for each statement execute procedure trigger_notice();
+create trigger trig_upd_after after update on parted2_stmt_trig
+ for each statement execute procedure trigger_notice();
+create trigger trig_del_before before delete on parted2_stmt_trig
+ for each statement execute procedure trigger_notice();
+create trigger trig_del_after after delete on parted2_stmt_trig
+ for each statement execute procedure trigger_notice();
+
+with ins (a) as (
+ insert into parted2_stmt_trig values (1), (2) returning a
+) insert into parted_stmt_trig select a from ins returning tableoid::regclass, a;
+
+with upd as (
+ update parted2_stmt_trig set a = a
+) update parted_stmt_trig set a = a;
+
+delete from parted_stmt_trig;
+drop table parted_stmt_trig, parted2_stmt_trig;
projects / postgresql / commitdiff