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Fire per-statement triggers on partitioned tables.
Even though no actual tuples are ever inserted into a partitioned table (the actual tuples are in the partitions, not the partitioned table itself), we still need to have a ResultRelInfo for the partitioned table, or per-statement triggers won't get fired. Amit Langote, per a report from Rajkumar Raghuwanshi. Reviewed by me. Discussion: http://postgr.es/m/CAKcux6%3DwYospCRY2J4XEFuVy0L41S%3Dfic7rmkbsU-GXhhSbmBg%40mail.gmail.com
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14 files changed

+296
-27
lines changed

14 files changed

+296
-27
lines changed

‎doc/src/sgml/trigger.sgml‎

Lines changed: 10 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -33,7 +33,8 @@
3333
<para>
3434
A trigger is a specification that the database should automatically
3535
execute a particular function whenever a certain type of operation is
36-
performed. Triggers can be attached to tables, views, and foreign tables.
36+
performed. Triggers can be attached to tables (partitioned or not),
37+
views, and foreign tables.
3738
</para>
3839

3940
<para>
@@ -111,14 +112,14 @@
111112
Statement-level <literal>BEFORE</> triggers naturally fire before the
112113
statement starts to do anything, while statement-level <literal>AFTER</>
113114
triggers fire at the very end of the statement. These types of
114-
triggers may be defined on tables or views. Row-level <literal>BEFORE</>
115-
triggers fire immediately before a particular row is operated on,
116-
while row-level <literal>AFTER</> triggers fire at the end of the
117-
statement (but before any statement-level <literal>AFTER</> triggers).
118-
These types of triggers may only be defined on tables and foreign tables.
119-
Row-level <literal>INSTEAD OF</> triggers may only be defined on views,
120-
and fire immediately as each row in the view is identified as needing to
121-
be operated on.
115+
triggers may be defined on tables, views, or foreign tables. Row-level
116+
<literal>BEFORE</> triggers fire immediately before a particular row is
117+
operated on, while row-level <literal>AFTER</> triggers fire at the end of
118+
the statement (but before any statement-level <literal>AFTER</> triggers).
119+
These types of triggers may only be defined on non-partitioned tables and
120+
foreign tables. Row-level <literal>INSTEAD OF</> triggers may only be
121+
defined on views, and fire immediately as each row in the view is
122+
identified as needing to be operated on.
122123
</para>
123124

124125
<para>

‎src/backend/executor/execMain.c‎

Lines changed: 50 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -861,17 +861,52 @@ InitPlan(QueryDesc *queryDesc, int eflags)
861861

862862
/*
863863
* In the partitioned result relation case, lock the non-leaf result
864-
* relations too. We don't however need ResultRelInfos for them.
864+
* relations too. A subset of these are the roots of respective
865+
* partitioned tables, for which we also allocate ResulRelInfos.
865866
*/
867+
estate->es_root_result_relations = NULL;
868+
estate->es_num_root_result_relations = 0;
866869
if (plannedstmt->nonleafResultRelations)
867870
{
871+
int num_roots = list_length(plannedstmt->rootResultRelations);
872+
873+
/*
874+
* Firstly, build ResultRelInfos for all the partitioned table
875+
* roots, because we will need them to fire the statement-level
876+
* triggers, if any.
877+
*/
878+
resultRelInfos = (ResultRelInfo *)
879+
palloc(num_roots * sizeof(ResultRelInfo));
880+
resultRelInfo = resultRelInfos;
881+
foreach(l, plannedstmt->rootResultRelations)
882+
{
883+
Index resultRelIndex = lfirst_int(l);
884+
Oid resultRelOid;
885+
Relation resultRelDesc;
886+
887+
resultRelOid = getrelid(resultRelIndex, rangeTable);
888+
resultRelDesc = heap_open(resultRelOid, RowExclusiveLock);
889+
InitResultRelInfo(resultRelInfo,
890+
resultRelDesc,
891+
lfirst_int(l),
892+
NULL,
893+
estate->es_instrument);
894+
resultRelInfo++;
895+
}
896+
897+
estate->es_root_result_relations = resultRelInfos;
898+
estate->es_num_root_result_relations = num_roots;
899+
900+
/* Simply lock the rest of them. */
868901
foreach(l, plannedstmt->nonleafResultRelations)
869902
{
870-
Index resultRelationIndex = lfirst_int(l);
871-
Oid resultRelationOid;
903+
Index resultRelIndex = lfirst_int(l);
872904

873-
resultRelationOid = getrelid(resultRelationIndex, rangeTable);
874-
LockRelationOid(resultRelationOid, RowExclusiveLock);
905+
/* We locked the roots above. */
906+
if (!list_member_int(plannedstmt->rootResultRelations,
907+
resultRelIndex))
908+
LockRelationOid(getrelid(resultRelIndex, rangeTable),
909+
RowExclusiveLock);
875910
}
876911
}
877912
}
@@ -883,6 +918,8 @@ InitPlan(QueryDesc *queryDesc, int eflags)
883918
estate->es_result_relations = NULL;
884919
estate->es_num_result_relations = 0;
885920
estate->es_result_relation_info = NULL;
921+
estate->es_root_result_relations = NULL;
922+
estate->es_num_root_result_relations = 0;
886923
}
887924

888925
/*
@@ -1565,6 +1602,14 @@ ExecEndPlan(PlanState *planstate, EState *estate)
15651602
resultRelInfo++;
15661603
}
15671604

1605+
/* Close the root target relation(s). */
1606+
resultRelInfo = estate->es_root_result_relations;
1607+
for (i = estate->es_num_root_result_relations; i > 0; i--)
1608+
{
1609+
heap_close(resultRelInfo->ri_RelationDesc, NoLock);
1610+
resultRelInfo++;
1611+
}
1612+
15681613
/*
15691614
* likewise close any trigger target relations
15701615
*/

‎src/backend/executor/nodeModifyTable.c‎

Lines changed: 34 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -1328,19 +1328,29 @@ ExecOnConflictUpdate(ModifyTableState *mtstate,
13281328
static void
13291329
fireBSTriggers(ModifyTableState *node)
13301330
{
1331+
ResultRelInfo *resultRelInfo = node->resultRelInfo;
1332+
1333+
/*
1334+
* If the node modifies a partitioned table, we must fire its triggers.
1335+
* Note that in that case, node->resultRelInfo points to the first leaf
1336+
* partition, not the root table.
1337+
*/
1338+
if (node->rootResultRelInfo != NULL)
1339+
resultRelInfo = node->rootResultRelInfo;
1340+
13311341
switch (node->operation)
13321342
{
13331343
case CMD_INSERT:
1334-
ExecBSInsertTriggers(node->ps.state, node->resultRelInfo);
1344+
ExecBSInsertTriggers(node->ps.state, resultRelInfo);
13351345
if (node->mt_onconflict == ONCONFLICT_UPDATE)
13361346
ExecBSUpdateTriggers(node->ps.state,
1337-
node->resultRelInfo);
1347+
resultRelInfo);
13381348
break;
13391349
case CMD_UPDATE:
1340-
ExecBSUpdateTriggers(node->ps.state, node->resultRelInfo);
1350+
ExecBSUpdateTriggers(node->ps.state, resultRelInfo);
13411351
break;
13421352
case CMD_DELETE:
1343-
ExecBSDeleteTriggers(node->ps.state, node->resultRelInfo);
1353+
ExecBSDeleteTriggers(node->ps.state, resultRelInfo);
13441354
break;
13451355
default:
13461356
elog(ERROR, "unknown operation");
@@ -1354,19 +1364,29 @@ fireBSTriggers(ModifyTableState *node)
13541364
static void
13551365
fireASTriggers(ModifyTableState *node)
13561366
{
1367+
ResultRelInfo *resultRelInfo = node->resultRelInfo;
1368+
1369+
/*
1370+
* If the node modifies a partitioned table, we must fire its triggers.
1371+
* Note that in that case, node->resultRelInfo points to the first leaf
1372+
* partition, not the root table.
1373+
*/
1374+
if (node->rootResultRelInfo != NULL)
1375+
resultRelInfo = node->rootResultRelInfo;
1376+
13571377
switch (node->operation)
13581378
{
13591379
case CMD_INSERT:
13601380
if (node->mt_onconflict == ONCONFLICT_UPDATE)
13611381
ExecASUpdateTriggers(node->ps.state,
1362-
node->resultRelInfo);
1363-
ExecASInsertTriggers(node->ps.state, node->resultRelInfo);
1382+
resultRelInfo);
1383+
ExecASInsertTriggers(node->ps.state, resultRelInfo);
13641384
break;
13651385
case CMD_UPDATE:
1366-
ExecASUpdateTriggers(node->ps.state, node->resultRelInfo);
1386+
ExecASUpdateTriggers(node->ps.state, resultRelInfo);
13671387
break;
13681388
case CMD_DELETE:
1369-
ExecASDeleteTriggers(node->ps.state, node->resultRelInfo);
1389+
ExecASDeleteTriggers(node->ps.state, resultRelInfo);
13701390
break;
13711391
default:
13721392
elog(ERROR, "unknown operation");
@@ -1652,6 +1672,12 @@ ExecInitModifyTable(ModifyTable *node, EState *estate, int eflags)
16521672

16531673
mtstate->mt_plans = (PlanState **) palloc0(sizeof(PlanState *) * nplans);
16541674
mtstate->resultRelInfo = estate->es_result_relations + node->resultRelIndex;
1675+
1676+
/* If modifying a partitioned table, initialize the root table info */
1677+
if (node->rootResultRelIndex >= 0)
1678+
mtstate->rootResultRelInfo = estate->es_root_result_relations +
1679+
node->rootResultRelIndex;
1680+
16551681
mtstate->mt_arowmarks = (List **) palloc0(sizeof(List *) * nplans);
16561682
mtstate->mt_nplans = nplans;
16571683
mtstate->mt_onconflict = node->onConflictAction;

‎src/backend/nodes/copyfuncs.c‎

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -91,6 +91,7 @@ _copyPlannedStmt(const PlannedStmt *from)
9191
COPY_NODE_FIELD(rtable);
9292
COPY_NODE_FIELD(resultRelations);
9393
COPY_NODE_FIELD(nonleafResultRelations);
94+
COPY_NODE_FIELD(rootResultRelations);
9495
COPY_NODE_FIELD(subplans);
9596
COPY_BITMAPSET_FIELD(rewindPlanIDs);
9697
COPY_NODE_FIELD(rowMarks);
@@ -205,6 +206,7 @@ _copyModifyTable(const ModifyTable *from)
205206
COPY_NODE_FIELD(partitioned_rels);
206207
COPY_NODE_FIELD(resultRelations);
207208
COPY_SCALAR_FIELD(resultRelIndex);
209+
COPY_SCALAR_FIELD(rootResultRelIndex);
208210
COPY_NODE_FIELD(plans);
209211
COPY_NODE_FIELD(withCheckOptionLists);
210212
COPY_NODE_FIELD(returningLists);

‎src/backend/nodes/outfuncs.c‎

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -253,6 +253,7 @@ _outPlannedStmt(StringInfo str, const PlannedStmt *node)
253253
WRITE_NODE_FIELD(rtable);
254254
WRITE_NODE_FIELD(resultRelations);
255255
WRITE_NODE_FIELD(nonleafResultRelations);
256+
WRITE_NODE_FIELD(rootResultRelations);
256257
WRITE_NODE_FIELD(subplans);
257258
WRITE_BITMAPSET_FIELD(rewindPlanIDs);
258259
WRITE_NODE_FIELD(rowMarks);
@@ -350,6 +351,7 @@ _outModifyTable(StringInfo str, const ModifyTable *node)
350351
WRITE_NODE_FIELD(partitioned_rels);
351352
WRITE_NODE_FIELD(resultRelations);
352353
WRITE_INT_FIELD(resultRelIndex);
354+
WRITE_INT_FIELD(rootResultRelIndex);
353355
WRITE_NODE_FIELD(plans);
354356
WRITE_NODE_FIELD(withCheckOptionLists);
355357
WRITE_NODE_FIELD(returningLists);
@@ -2145,6 +2147,7 @@ _outPlannerGlobal(StringInfo str, const PlannerGlobal *node)
21452147
WRITE_NODE_FIELD(finalrowmarks);
21462148
WRITE_NODE_FIELD(resultRelations);
21472149
WRITE_NODE_FIELD(nonleafResultRelations);
2150+
WRITE_NODE_FIELD(rootResultRelations);
21482151
WRITE_NODE_FIELD(relationOids);
21492152
WRITE_NODE_FIELD(invalItems);
21502153
WRITE_INT_FIELD(nParamExec);

‎src/backend/nodes/readfuncs.c‎

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1453,6 +1453,7 @@ _readPlannedStmt(void)
14531453
READ_NODE_FIELD(rtable);
14541454
READ_NODE_FIELD(resultRelations);
14551455
READ_NODE_FIELD(nonleafResultRelations);
1456+
READ_NODE_FIELD(rootResultRelations);
14561457
READ_NODE_FIELD(subplans);
14571458
READ_BITMAPSET_FIELD(rewindPlanIDs);
14581459
READ_NODE_FIELD(rowMarks);
@@ -1548,6 +1549,7 @@ _readModifyTable(void)
15481549
READ_NODE_FIELD(partitioned_rels);
15491550
READ_NODE_FIELD(resultRelations);
15501551
READ_INT_FIELD(resultRelIndex);
1552+
READ_INT_FIELD(rootResultRelIndex);
15511553
READ_NODE_FIELD(plans);
15521554
READ_NODE_FIELD(withCheckOptionLists);
15531555
READ_NODE_FIELD(returningLists);

‎src/backend/optimizer/plan/createplan.c‎

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -6437,6 +6437,7 @@ make_modifytable(PlannerInfo *root,
64376437
node->partitioned_rels = partitioned_rels;
64386438
node->resultRelations = resultRelations;
64396439
node->resultRelIndex = -1; /* will be set correctly in setrefs.c */
6440+
node->rootResultRelIndex = -1; /* will be set correctly in setrefs.c */
64406441
node->plans = subplans;
64416442
if (!onconflict)
64426443
{

‎src/backend/optimizer/plan/planner.c‎

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -240,6 +240,7 @@ standard_planner(Query *parse, int cursorOptions, ParamListInfo boundParams)
240240
glob->finalrowmarks = NIL;
241241
glob->resultRelations = NIL;
242242
glob->nonleafResultRelations = NIL;
243+
glob->rootResultRelations = NIL;
243244
glob->relationOids = NIL;
244245
glob->invalItems = NIL;
245246
glob->nParamExec = 0;
@@ -408,6 +409,7 @@ standard_planner(Query *parse, int cursorOptions, ParamListInfo boundParams)
408409
Assert(glob->finalrowmarks == NIL);
409410
Assert(glob->resultRelations == NIL);
410411
Assert(glob->nonleafResultRelations == NIL);
412+
Assert(glob->rootResultRelations == NIL);
411413
top_plan = set_plan_references(root, top_plan);
412414
/* ... and the subplans (both regular subplans and initplans) */
413415
Assert(list_length(glob->subplans) == list_length(glob->subroots));
@@ -434,6 +436,7 @@ standard_planner(Query *parse, int cursorOptions, ParamListInfo boundParams)
434436
result->rtable = glob->finalrtable;
435437
result->resultRelations = glob->resultRelations;
436438
result->nonleafResultRelations = glob->nonleafResultRelations;
439+
result->rootResultRelations = glob->rootResultRelations;
437440
result->subplans = glob->subplans;
438441
result->rewindPlanIDs = glob->rewindPlanIDs;
439442
result->rowMarks = glob->finalrowmarks;

‎src/backend/optimizer/plan/setrefs.c‎

Lines changed: 15 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -882,11 +882,22 @@ set_plan_refs(PlannerInfo *root, Plan *plan, int rtoffset)
882882
/*
883883
* If the main target relation is a partitioned table, the
884884
* following list contains the RT indexes of partitioned child
885-
* relations, which are not included in the above list.
885+
* relations including the root, which are not included in the
886+
* above list. We also keep RT indexes of the roots separately
887+
* to be identitied as such during the executor initialization.
886888
*/
887-
root->glob->nonleafResultRelations =
888-
list_concat(root->glob->nonleafResultRelations,
889-
list_copy(splan->partitioned_rels));
889+
if (splan->partitioned_rels != NIL)
890+
{
891+
root->glob->nonleafResultRelations =
892+
list_concat(root->glob->nonleafResultRelations,
893+
list_copy(splan->partitioned_rels));
894+
/* Remember where this root will be in the global list. */
895+
splan->rootResultRelIndex =
896+
list_length(root->glob->rootResultRelations);
897+
root->glob->rootResultRelations =
898+
lappend_int(root->glob->rootResultRelations,
899+
linitial_int(splan->partitioned_rels));
900+
}
890901
}
891902
break;
892903
case T_Append:

‎src/include/nodes/execnodes.h‎

Lines changed: 12 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -422,6 +422,16 @@ typedef struct EState
422422
int es_num_result_relations; /* length of array */
423423
ResultRelInfo *es_result_relation_info; /* currently active array elt */
424424

425+
/*
426+
* Info about the target partitioned target table root(s) for
427+
* update/delete queries. They required only to fire any per-statement
428+
* triggers defined on the table. It exists separately from
429+
* es_result_relations, because partitioned tables don't appear in the
430+
* plan tree for the update/delete cases.
431+
*/
432+
ResultRelInfo *es_root_result_relations; /* array of ResultRelInfos */
433+
int es_num_root_result_relations; /* length of the array */
434+
425435
/* Stuff used for firing triggers: */
426436
List *es_trig_target_relations; /* trigger-only ResultRelInfos */
427437
TupleTableSlot *es_trig_tuple_slot; /* for trigger output tuples */
@@ -914,6 +924,8 @@ typedef struct ModifyTableState
914924
int mt_nplans; /* number of plans in the array */
915925
int mt_whichplan; /* which one is being executed (0..n-1) */
916926
ResultRelInfo *resultRelInfo; /* per-subplan target relations */
927+
ResultRelInfo *rootResultRelInfo; /* root target relation (partitioned
928+
* table root) */
917929
List **mt_arowmarks; /* per-subplan ExecAuxRowMark lists */
918930
EPQState mt_epqstate; /* for evaluating EvalPlanQual rechecks */
919931
bool fireBSTriggers; /* do we need to fire stmt triggers? */

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