-
Notifications
You must be signed in to change notification settings - Fork 28
/
Copy pathmatview.c
3321 lines (2876 loc) · 95 KB
/
matview.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*-------------------------------------------------------------------------
*
* matview.c
* Incremental view maintenance extension
* Routines for incremental maintenance of IMMVs
*
* Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
* Portions Copyright (c) 2022, IVM Development Group
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/genam.h"
#include "access/multixact.h"
#include "access/table.h"
#include "access/tableam.h"
#include "access/xact.h"
#include "catalog/pg_depend.h"
#include "catalog/heap.h"
#include "catalog/pg_trigger.h"
#include "commands/cluster.h"
#include "commands/defrem.h"
#include "commands/matview.h"
#include "commands/tablecmds.h"
#include "executor/execdesc.h"
#include "executor/executor.h"
#include "executor/spi.h"
#include "executor/tstoreReceiver.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
#include "parser/analyze.h"
#include "parser/parse_clause.h"
#include "parser/parse_func.h"
#include "parser/parse_relation.h"
#include "parser/parser.h"
#include "pgstat.h"
#include "rewrite/rewriteHandler.h"
#include "rewrite/rewriteManip.h"
#include "rewrite/rowsecurity.h"
#include "storage/lmgr.h"
#include "tcop/tcopprot.h"
#include "utils/builtins.h"
#include "utils/fmgroids.h"
#include "utils/fmgrprotos.h"
#include "utils/hsearch.h"
#include "utils/lsyscache.h"
#include "utils/rel.h"
#include "utils/snapmgr.h"
#include "utils/typcache.h"
#include "pg_ivm.h"
#define MV_INIT_QUERYHASHSIZE 16
/* MV query type codes */
#define MV_PLAN_RECALC 1
#define MV_PLAN_SET_VALUE 2
/*
* MI_QueryKey
*
* The key identifying a prepared SPI plan in our query hashtable
*/
typedef struct MV_QueryKey
{
Oid matview_id; /* OID of materialized view */
int32 query_type; /* query type ID, see MV_PLAN_XXX above */
} MV_QueryKey;
/*
* MV_QueryHashEntry
*
* Hash entry for cached plans used to maintain materialized views.
*/
typedef struct MV_QueryHashEntry
{
MV_QueryKey key;
SPIPlanPtr plan;
#if PG_VERSION_NUM < 170000
OverrideSearchPath *search_path; /* search_path used for parsing
* and planning */
#else
SearchPathMatcher *search_path; /* search_path used for parsing
* and planning */
#endif
} MV_QueryHashEntry;
/*
* MV_TriggerHashEntry
*
* Hash entry for base tables on which IVM trigger is invoked
*/
typedef struct MV_TriggerHashEntry
{
Oid matview_id; /* OID of the materialized view */
int before_trig_count; /* count of before triggers invoked */
int after_trig_count; /* count of after triggers invoked */
Snapshot snapshot; /* Snapshot just before table change */
List *tables; /* List of MV_TriggerTable */
bool has_old; /* tuples are deleted from any table? */
bool has_new; /* tuples are inserted into any table? */
} MV_TriggerHashEntry;
/*
* MV_TriggerTable
*
* IVM related data for tables on which the trigger is invoked.
*/
typedef struct MV_TriggerTable
{
Oid table_id; /* OID of the modified table */
List *old_tuplestores; /* tuplestores for deleted tuples */
List *new_tuplestores; /* tuplestores for inserted tuples */
List *old_rtes; /* RTEs of ENRs for old_tuplestores*/
List *new_rtes; /* RTEs of ENRs for new_tuplestores */
List *rte_paths; /* List of paths to RTE index of the modified table */
RangeTblEntry *original_rte; /* the original RTE saved before rewriting query */
Relation rel; /* relation of the modified table */
TupleTableSlot *slot; /* for checking visibility in the pre-state table */
} MV_TriggerTable;
static HTAB *mv_query_cache = NULL;
static HTAB *mv_trigger_info = NULL;
static bool in_delta_calculation = false;
/* kind of IVM operation for the view */
typedef enum
{
IVM_ADD,
IVM_SUB
} IvmOp;
/* ENR name for materialized view delta */
#define NEW_DELTA_ENRNAME "new_delta"
#define OLD_DELTA_ENRNAME "old_delta"
static int immv_maintenance_depth = 0;
static uint64 refresh_immv_datafill(DestReceiver *dest, Query *query,
QueryEnvironment *queryEnv,
TupleDesc *resultTupleDesc,
const char *queryString);
static void refresh_by_heap_swap(Oid matviewOid, Oid OIDNewHeap, char relpersistence);
static void OpenImmvIncrementalMaintenance(void);
static void CloseImmvIncrementalMaintenance(void);
static Query *rewrite_query_for_preupdate_state(Query *query, List *tables,
ParseState *pstate, List *rte_path, Oid matviewid);
static void register_delta_ENRs(ParseState *pstate, Query *query, List *tables);
static char*make_subquery_targetlist_from_table(MV_TriggerTable *table);
static char *make_delta_enr_name(const char *prefix, Oid relid, int count);
static RangeTblEntry *get_prestate_rte(RangeTblEntry *rte, MV_TriggerTable *table,
QueryEnvironment *queryEnv, Oid matviewid);
static RangeTblEntry *union_ENRs(RangeTblEntry *rte, MV_TriggerTable *table, List *enr_rtes,
const char *prefix, QueryEnvironment *queryEnv);
static Query *rewrite_query_for_distinct_and_aggregates(Query *query, ParseState *pstate);
static void calc_delta(MV_TriggerTable *table, List *rte_path, Query *query,
DestReceiver *dest_old, DestReceiver *dest_new,
TupleDesc *tupdesc_old, TupleDesc *tupdesc_new,
QueryEnvironment *queryEnv);
static Query *rewrite_query_for_postupdate_state(Query *query, MV_TriggerTable *table, List *rte_path);
static ListCell *getRteListCell(Query *query, List *rte_path);
static void apply_delta(Oid matviewOid, Tuplestorestate *old_tuplestores, Tuplestorestate *new_tuplestores,
TupleDesc tupdesc_old, TupleDesc tupdesc_new,
Query *query, bool use_count, char *count_colname);
static void append_set_clause_for_count(const char *resname, StringInfo buf_old,
StringInfo buf_new,StringInfo aggs_list);
static void append_set_clause_for_sum(const char *resname, StringInfo buf_old,
StringInfo buf_new, StringInfo aggs_list);
static void append_set_clause_for_avg(const char *resname, StringInfo buf_old,
StringInfo buf_new, StringInfo aggs_list,
const char *aggtype);
static void append_set_clause_for_minmax(const char *resname, StringInfo buf_old,
StringInfo buf_new, StringInfo aggs_list,
bool is_min);
static char *get_operation_string(IvmOp op, const char *col, const char *arg1, const char *arg2,
const char* count_col, const char *castType);
static char *get_null_condition_string(IvmOp op, const char *arg1, const char *arg2,
const char* count_col);
static void apply_old_delta(const char *matviewname, const char *deltaname_old,
List *keys);
static void apply_old_delta_with_count(const char *matviewname, const char *deltaname_old,
List *keys, StringInfo aggs_list, StringInfo aggs_set,
List *minmax_list, List *is_min_list,
const char *count_colname,
SPITupleTable **tuptable_recalc, uint64 *num_recalc);
static void apply_new_delta(const char *matviewname, const char *deltaname_new,
StringInfo target_list);
static void apply_new_delta_with_count(const char *matviewname, const char* deltaname_new,
List *keys, StringInfo target_list, StringInfo aggs_set,
const char* count_colname, bool distinct);
static char *get_matching_condition_string(List *keys);
static char *get_returning_string(List *minmax_list, List *is_min_list, List *keys);
static char *get_minmax_recalc_condition_string(List *minmax_list, List *is_min_list);
static char *get_select_for_recalc_string(List *keys);
static void recalc_and_set_values(SPITupleTable *tuptable_recalc, int64 num_tuples,
List *namelist, List *keys, Relation matviewRel);
static SPIPlanPtr get_plan_for_recalc(Relation matviewRel, List *namelist, List *keys, Oid *keyTypes);
static SPIPlanPtr get_plan_for_set_values(Relation matviewRel, List *namelist, Oid *valTypes);
static void generate_equal(StringInfo querybuf, Oid opttype,
const char *leftop, const char *rightop);
static void mv_InitHashTables(void);
static SPIPlanPtr mv_FetchPreparedPlan(MV_QueryKey *key);
static void mv_HashPreparedPlan(MV_QueryKey *key, SPIPlanPtr plan);
static void mv_BuildQueryKey(MV_QueryKey *key, Oid matview_id, int32 query_type);
static void clean_up_IVM_hash_entry(MV_TriggerHashEntry *entry, bool is_abort);
/* SQL callable functions */
PG_FUNCTION_INFO_V1(IVM_immediate_before);
PG_FUNCTION_INFO_V1(IVM_immediate_maintenance);
PG_FUNCTION_INFO_V1(ivm_visible_in_prestate);
/*
* ExecRefreshImmv -- execute a refresh_immv() function
*
* This imitates PostgreSQL's ExecRefreshMatView().
*/
ObjectAddress
ExecRefreshImmv(const RangeVar *relation, bool skipData,
const char *queryString, QueryCompletion *qc)
{
Oid matviewOid;
LOCKMODE lockmode;
/* Determine strength of lock needed. */
//concurrent = stmt->concurrent;
//lockmode = concurrent ? ExclusiveLock : AccessExclusiveLock;
lockmode = AccessExclusiveLock;
/*
* Get a lock until end of transaction.
*/
#if defined(PG_VERSION_NUM) && (PG_VERSION_NUM < 170000)
matviewOid = RangeVarGetRelidExtended(relation,
lockmode, 0,
RangeVarCallbackOwnsTable,
NULL);
#else
matviewOid = RangeVarGetRelidExtended(relation,
lockmode, 0,
RangeVarCallbackMaintainsTable,
NULL);
#endif
return RefreshImmvByOid(matviewOid, skipData, queryString, qc);
}
/*
* RefreshMatViewByOid -- refresh IMMV view by OID
*
* This imitates PostgreSQL's RefreshMatViewByOid().
*/
ObjectAddress
RefreshImmvByOid(Oid matviewOid, bool skipData,
const char *queryString, QueryCompletion *qc)
{
Relation matviewRel;
Query *dataQuery = NULL; /* initialized to keep compiler happy */
Query *viewQuery;
Oid tableSpace;
Oid relowner;
Oid OIDNewHeap;
DestReceiver *dest;
uint64 processed = 0;
char relpersistence;
Oid save_userid;
int save_sec_context;
int save_nestlevel;
ObjectAddress address;
bool oldPopulated;
Relation pgIvmImmv;
TupleDesc tupdesc;
ScanKeyData key;
SysScanDesc scan;
HeapTuple tup;
bool isnull;
Datum datum;
matviewRel = table_open(matviewOid, NoLock);
relowner = matviewRel->rd_rel->relowner;
/*
* Switch to the owner's userid, so that any functions are run as that
* user. Also lock down security-restricted operations and arrange to
* make GUC variable changes local to this command.
*/
GetUserIdAndSecContext(&save_userid, &save_sec_context);
SetUserIdAndSecContext(relowner,
save_sec_context | SECURITY_RESTRICTED_OPERATION);
save_nestlevel = NewGUCNestLevel();
#if defined(PG_VERSION_NUM) && (PG_VERSION_NUM >= 170000)
RestrictSearchPath();
#endif
/*
* Make sure it is an IMMV:
* Get the entry in pg_ivm_immv. If it doesn't exist, the relation
* is not IMMV.
*/
pgIvmImmv = table_open(PgIvmImmvRelationId(), RowExclusiveLock);
tupdesc = RelationGetDescr(pgIvmImmv);
ScanKeyInit(&key,
Anum_pg_ivm_immv_immvrelid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(RelationGetRelid(matviewRel)));
scan = systable_beginscan(pgIvmImmv, PgIvmImmvPrimaryKeyIndexId(),
true, NULL, 1, &key);
tup = systable_getnext(scan);
if (!HeapTupleIsValid(tup))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("\"%s\" is not an IMMV",
RelationGetRelationName(matviewRel))));
datum = heap_getattr(tup, Anum_pg_ivm_immv_ispopulated, tupdesc, &isnull);
Assert(!isnull);
oldPopulated = DatumGetBool(datum);
/*
* Check for active uses of the relation in the current transaction, such
* as open scans.
*
* NB: We count on this to protect us against problems with refreshing the
* data using TABLE_INSERT_FROZEN.
*/
CheckTableNotInUse(matviewRel, "refresh an IMMV");
/* Tentatively mark the IMMV as populated or not (this will roll back
* if we fail later).
*/
if (skipData != (!oldPopulated))
{
Datum values[Natts_pg_ivm_immv];
bool nulls[Natts_pg_ivm_immv];
bool replaces[Natts_pg_ivm_immv];
HeapTuple newtup = NULL;
memset(values, 0, sizeof(values));
values[Anum_pg_ivm_immv_ispopulated -1 ] = BoolGetDatum(!skipData);
MemSet(nulls, false, sizeof(nulls));
MemSet(replaces, false, sizeof(replaces));
replaces[Anum_pg_ivm_immv_ispopulated -1 ] = true;
newtup = heap_modify_tuple(tup, tupdesc, values, nulls, replaces);
CatalogTupleUpdate(pgIvmImmv, &newtup->t_self, newtup);
heap_freetuple(newtup);
/*
* Advance command counter to make the updated pg_ivm_immv row locally
* visible.
*/
CommandCounterIncrement();
}
systable_endscan(scan);
table_close(pgIvmImmv, NoLock);
viewQuery = get_immv_query(matviewRel);
/* For IMMV, we need to rewrite matview query */
if (!skipData)
dataQuery = rewriteQueryForIMMV(viewQuery,NIL);
tableSpace = matviewRel->rd_rel->reltablespace;
relpersistence = matviewRel->rd_rel->relpersistence;
/* delete IMMV triggers. */
if (skipData)
{
Relation tgRel;
Relation depRel;
ObjectAddresses *immv_triggers;
immv_triggers = new_object_addresses();
tgRel = table_open(TriggerRelationId, RowExclusiveLock);
depRel = table_open(DependRelationId, RowExclusiveLock);
/* search triggers that depends on IMMV. */
ScanKeyInit(&key,
Anum_pg_depend_refobjid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(matviewOid));
scan = systable_beginscan(depRel, DependReferenceIndexId, true,
NULL, 1, &key);
while ((tup = systable_getnext(scan)) != NULL)
{
ObjectAddress obj;
Form_pg_depend foundDep = (Form_pg_depend) GETSTRUCT(tup);
if (foundDep->classid == TriggerRelationId)
{
HeapTuple tgtup;
ScanKeyData tgkey[1];
SysScanDesc tgscan;
Form_pg_trigger tgform;
/* Find the trigger name. */
ScanKeyInit(&tgkey[0],
Anum_pg_trigger_oid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(foundDep->objid));
tgscan = systable_beginscan(tgRel, TriggerOidIndexId, true,
NULL, 1, tgkey);
tgtup = systable_getnext(tgscan);
if (!HeapTupleIsValid(tgtup))
elog(ERROR, "could not find tuple for immv trigger %u", foundDep->objid);
tgform = (Form_pg_trigger) GETSTRUCT(tgtup);
/* If trigger is created by IMMV, delete it. */
if (strncmp(NameStr(tgform->tgname), "IVM_trigger_", 12) == 0)
{
obj.classId = foundDep->classid;
obj.objectId = foundDep->objid;
obj.objectSubId = foundDep->refobjsubid;
add_exact_object_address(&obj, immv_triggers);
}
systable_endscan(tgscan);
}
}
systable_endscan(scan);
performMultipleDeletions(immv_triggers, DROP_RESTRICT, PERFORM_DELETION_INTERNAL);
table_close(depRel, RowExclusiveLock);
table_close(tgRel, RowExclusiveLock);
free_object_addresses(immv_triggers);
}
/*
* Create the transient table that will receive the regenerated data. Lock
* it against access by any other process until commit (by which time it
* will be gone).
*/
#if defined(PG_VERSION_NUM) && (PG_VERSION_NUM >= 150000)
OIDNewHeap = make_new_heap(matviewOid, tableSpace,
matviewRel->rd_rel->relam, relpersistence, ExclusiveLock);
#else
OIDNewHeap = make_new_heap(matviewOid, tableSpace,
relpersistence, ExclusiveLock);
#endif
LockRelationOid(OIDNewHeap, AccessExclusiveLock);
dest = CreateTransientRelDestReceiver(OIDNewHeap);
/* Generate the data, if wanted. */
if (!skipData)
processed = refresh_immv_datafill(dest, dataQuery, NULL, NULL, queryString);
/* Make the matview match the newly generated data. */
refresh_by_heap_swap(matviewOid, OIDNewHeap, relpersistence);
/*
* Inform cumulative stats system about our activity: basically, we
* truncated the matview and inserted some new data. (The concurrent
* code path above doesn't need to worry about this because the
* inserts and deletes it issues get counted by lower-level code.)
*/
pgstat_count_truncate(matviewRel);
if (!skipData)
pgstat_count_heap_insert(matviewRel, processed);
/*
* Create triggers on incremental maintainable materialized view
* This argument should use 'dataQuery'. This needs to use a rewritten query,
* because a sublink in jointree is not supported by this function.
*/
if (!skipData && !oldPopulated)
CreateIvmTriggersOnBaseTables(dataQuery, matviewOid);
table_close(matviewRel, NoLock);
/* Roll back any GUC changes */
AtEOXact_GUC(false, save_nestlevel);
/* Restore userid and security context */
SetUserIdAndSecContext(save_userid, save_sec_context);
ObjectAddressSet(address, RelationRelationId, matviewOid);
/*
* Save the rowcount so that pg_stat_statements can track the total number
* of rows processed by REFRESH MATERIALIZED VIEW command. Note that we
* still don't display the rowcount in the command completion tag output,
* i.e., the display_rowcount flag of CMDTAG_REFRESH_MATERIALIZED_VIEW
* command tag is left false in cmdtaglist.h. Otherwise, the change of
* completion tag output might break applications using it.
*/
if (qc)
SetQueryCompletion(qc, CMDTAG_REFRESH_MATERIALIZED_VIEW, processed);
return address;
}
/*
* refresh_immv_datafill
*
* Execute the given query, sending result rows to "dest" (which will
* insert them into the target matview).
*
* Returns number of rows inserted.
*/
static uint64
refresh_immv_datafill(DestReceiver *dest, Query *query,
QueryEnvironment *queryEnv,
TupleDesc *resultTupleDesc,
const char *queryString)
{
List *rewritten;
PlannedStmt *plan;
QueryDesc *queryDesc;
Query *copied_query;
uint64 processed;
/* Lock and rewrite, using a copy to preserve the original query. */
copied_query = copyObject(query);
AcquireRewriteLocks(copied_query, true, false);
rewritten = QueryRewrite(copied_query);
/* SELECT should never rewrite to more or less than one SELECT query */
if (list_length(rewritten) != 1)
elog(ERROR, "unexpected rewrite result for REFRESH MATERIALIZED VIEW");
query = (Query *) linitial(rewritten);
/* Check for user-requested abort. */
CHECK_FOR_INTERRUPTS();
/* Plan the query which will generate data for the refresh. */
plan = pg_plan_query(query, queryString, CURSOR_OPT_PARALLEL_OK, NULL);
/*
* Use a snapshot with an updated command ID to ensure this query sees
* results of any previously executed queries. (This could only matter if
* the planner executed an allegedly-stable function that changed the
* database contents, but let's do it anyway to be safe.)
*/
PushCopiedSnapshot(GetActiveSnapshot());
UpdateActiveSnapshotCommandId();
/* Create a QueryDesc, redirecting output to our tuple receiver */
queryDesc = CreateQueryDesc(plan, queryString,
GetActiveSnapshot(), InvalidSnapshot,
dest, NULL, queryEnv ? queryEnv: NULL, 0);
/* call ExecutorStart to prepare the plan for execution */
ExecutorStart(queryDesc, 0);
/* run the plan */
ExecutorRun(queryDesc, ForwardScanDirection, 0, true);
processed = queryDesc->estate->es_processed;
if (resultTupleDesc)
*resultTupleDesc = CreateTupleDescCopy(queryDesc->tupDesc);
/* and clean up */
ExecutorFinish(queryDesc);
ExecutorEnd(queryDesc);
FreeQueryDesc(queryDesc);
PopActiveSnapshot();
return processed;
}
/*
* Swap the physical files of the target and transient tables, then rebuild
* the target's indexes and throw away the transient table. Security context
* swapping is handled by the called function, so it is not needed here.
*/
static void
refresh_by_heap_swap(Oid matviewOid, Oid OIDNewHeap, char relpersistence)
{
finish_heap_swap(matviewOid, OIDNewHeap, false, false, true, true,
RecentXmin, ReadNextMultiXactId(), relpersistence);
}
/*
* This should be used to test whether the backend is in a context where it is
* OK to allow DML statements to modify IMMVs. We only want to
* allow that for internal code driven by the IMMV definition,
* not for arbitrary user-supplied code.
*/
bool
ImmvIncrementalMaintenanceIsEnabled(void)
{
return immv_maintenance_depth > 0;
}
static void
OpenImmvIncrementalMaintenance(void)
{
immv_maintenance_depth++;
}
static void
CloseImmvIncrementalMaintenance(void)
{
immv_maintenance_depth--;
Assert(immv_maintenance_depth >= 0);
}
/*
* get_immv_query - get the Query of IMMV.
*/
Query *
get_immv_query(Relation matviewRel)
{
Relation pgIvmImmv = table_open(PgIvmImmvRelationId(), AccessShareLock);
TupleDesc tupdesc = RelationGetDescr(pgIvmImmv);
SysScanDesc scan;
ScanKeyData key;
HeapTuple tup;
bool isnull;
Datum datum;
Query *query;
ScanKeyInit(&key,
Anum_pg_ivm_immv_immvrelid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(RelationGetRelid(matviewRel)));
scan = systable_beginscan(pgIvmImmv, PgIvmImmvPrimaryKeyIndexId(),
true, NULL, 1, &key);
tup = systable_getnext(scan);
if (!HeapTupleIsValid(tup))
{
systable_endscan(scan);
table_close(pgIvmImmv, NoLock);
return NULL;
}
datum = heap_getattr(tup, Anum_pg_ivm_immv_viewdef, tupdesc, &isnull);
Assert(!isnull);
query = (Query *) stringToNode(TextDatumGetCString(datum));
systable_endscan(scan);
table_close(pgIvmImmv, NoLock);
return query;
}
static Tuplestorestate *
tuplestore_copy(Tuplestorestate *tuplestore, Relation rel)
{
Tuplestorestate *res = NULL;
TupleDesc tupdesc = RelationGetDescr(rel);
TupleTableSlot *slot = MakeSingleTupleTableSlot(tupdesc, &TTSOpsMinimalTuple);
tuplestore_rescan(tuplestore);
res = tuplestore_begin_heap(false, false, work_mem);
while (tuplestore_gettupleslot(tuplestore, true, false, slot))
tuplestore_puttupleslot(res, slot);
ExecDropSingleTupleTableSlot(slot);
return res;
}
/* ----------------------------------------------------
* Incremental View Maintenance routines
* ---------------------------------------------------
*/
/*
* IVM_immediate_before
*
* IVM trigger function invoked before base table is modified. If this is
* invoked firstly in the same statement, we save the transaction id and the
* command id at that time.
*/
Datum
IVM_immediate_before(PG_FUNCTION_ARGS)
{
TriggerData *trigdata = (TriggerData *) fcinfo->context;
char *matviewOid_text = trigdata->tg_trigger->tgargs[0];
char *ex_lock_text = trigdata->tg_trigger->tgargs[1];
Oid matviewOid;
MV_TriggerHashEntry *entry;
bool found;
bool ex_lock;
matviewOid = DatumGetObjectId(DirectFunctionCall1(oidin, CStringGetDatum(matviewOid_text)));
ex_lock = DatumGetBool(DirectFunctionCall1(boolin, CStringGetDatum(ex_lock_text)));
/* If the view has more than one tables, we have to use an exclusive lock. */
if (ex_lock)
{
/*
* Wait for concurrent transactions which update this materialized view at
* READ COMMITED. This is needed to see changes committed in other
* transactions. No wait and raise an error at REPEATABLE READ or
* SERIALIZABLE to prevent update anomalies of matviews.
* XXX: dead-lock is possible here.
*/
if (!IsolationUsesXactSnapshot())
LockRelationOid(matviewOid, ExclusiveLock);
else if (!ConditionalLockRelationOid(matviewOid, ExclusiveLock))
{
/* try to throw error by name; relation could be deleted... */
char *relname = get_rel_name(matviewOid);
if (!relname)
ereport(ERROR,
(errcode(ERRCODE_LOCK_NOT_AVAILABLE),
errmsg("could not obtain lock on materialized view during incremental maintenance")));
ereport(ERROR,
(errcode(ERRCODE_LOCK_NOT_AVAILABLE),
errmsg("could not obtain lock on materialized view \"%s\" during incremental maintenance",
relname)));
}
}
else
LockRelationOid(matviewOid, RowExclusiveLock);
/*
* On the first call initialize the hashtable
*/
if (!mv_trigger_info)
mv_InitHashTables();
entry = (MV_TriggerHashEntry *) hash_search(mv_trigger_info,
(void *) &matviewOid,
HASH_ENTER, &found);
/* On the first BEFORE to update the view, initialize trigger data */
if (!found)
{
/*
* Get a snapshot just before the table was modified for checking
* tuple visibility in the pre-update state of the table.
*/
Snapshot snapshot = GetActiveSnapshot();
entry->matview_id = matviewOid;
entry->before_trig_count = 0;
entry->after_trig_count = 0;
entry->snapshot = RegisterSnapshot(snapshot);
entry->tables = NIL;
entry->has_old = false;
entry->has_new = false;
}
entry->before_trig_count++;
return PointerGetDatum(NULL);
}
/*
* IVM_immediate_maintenance
*
* IVM trigger function invoked after base table is modified.
* For each table, tuplestores of transition tables are collected.
* and after the last modification
*/
Datum
IVM_immediate_maintenance(PG_FUNCTION_ARGS)
{
TriggerData *trigdata = (TriggerData *) fcinfo->context;
Relation rel;
Oid relid;
Oid matviewOid;
Query *query;
Query *rewritten = NULL;
char *matviewOid_text = trigdata->tg_trigger->tgargs[0];
Relation matviewRel;
int old_depth = immv_maintenance_depth;
Oid relowner;
Tuplestorestate *old_tuplestore = NULL;
Tuplestorestate *new_tuplestore = NULL;
DestReceiver *dest_new = NULL, *dest_old = NULL;
Oid save_userid;
int save_sec_context;
int save_nestlevel;
MV_TriggerHashEntry *entry;
MV_TriggerTable *table;
bool found;
ParseState *pstate;
QueryEnvironment *queryEnv = create_queryEnv();
MemoryContext oldcxt;
ListCell *lc;
int i;
/* Create a ParseState for rewriting the view definition query */
pstate = make_parsestate(NULL);
pstate->p_queryEnv = queryEnv;
pstate->p_expr_kind = EXPR_KIND_SELECT_TARGET;
rel = trigdata->tg_relation;
relid = rel->rd_id;
matviewOid = DatumGetObjectId(DirectFunctionCall1(oidin, CStringGetDatum(matviewOid_text)));
/*
* On the first call initialize the hashtable
*/
if (!mv_trigger_info)
mv_InitHashTables();
/* get the entry for this materialized view */
entry = (MV_TriggerHashEntry *) hash_search(mv_trigger_info,
(void *) &matviewOid,
HASH_FIND, &found);
Assert (found && entry != NULL);
entry->after_trig_count++;
/* search the entry for the modified table and create new entry if not found */
found = false;
foreach(lc, entry->tables)
{
table = (MV_TriggerTable *) lfirst(lc);
if (table->table_id == relid)
{
found = true;
break;
}
}
if (!found)
{
oldcxt = MemoryContextSwitchTo(TopTransactionContext);
table = (MV_TriggerTable *) palloc0(sizeof(MV_TriggerTable));
table->table_id = relid;
table->old_tuplestores = NIL;
table->new_tuplestores = NIL;
table->old_rtes = NIL;
table->new_rtes = NIL;
table->rte_paths = NIL;
table->slot = MakeSingleTupleTableSlot(RelationGetDescr(rel), table_slot_callbacks(rel));
/* We assume we have at least RowExclusiveLock on modified tables. */
table->rel = table_open(RelationGetRelid(rel), NoLock);
entry->tables = lappend(entry->tables, table);
MemoryContextSwitchTo(oldcxt);
}
/* Save the transition tables and make a request to not free immediately */
if (trigdata->tg_oldtable)
{
oldcxt = MemoryContextSwitchTo(TopTransactionContext);
table->old_tuplestores = lappend(table->old_tuplestores, tuplestore_copy(trigdata->tg_oldtable, rel));
entry->has_old = true;
MemoryContextSwitchTo(oldcxt);
}
if (trigdata->tg_newtable)
{
oldcxt = MemoryContextSwitchTo(TopTransactionContext);
table->new_tuplestores = lappend(table->new_tuplestores, tuplestore_copy(trigdata->tg_newtable, rel));
entry->has_new = true;
MemoryContextSwitchTo(oldcxt);
}
/* If this is not the last AFTER trigger call, immediately exit. */
Assert (entry->before_trig_count >= entry->after_trig_count);
if (entry->before_trig_count != entry->after_trig_count)
return PointerGetDatum(NULL);
/*
* If this is the last AFTER trigger call, continue and update the view.
*/
/*
* Advance command counter to make the updated base table row locally
* visible.
*/
CommandCounterIncrement();
matviewRel = table_open(matviewOid, NoLock);
/* Make sure IMMV is a table. */
Assert(matviewRel->rd_rel->relkind == RELKIND_RELATION);
/*
* Get and push the latast snapshot to see any changes which is committed
* during waiting in other transactions at READ COMMITTED level.
*/
PushActiveSnapshot(GetTransactionSnapshot());
/*
* Check for active uses of the relation in the current transaction, such
* as open scans.
*
* NB: We count on this to protect us against problems with refreshing the
* data using TABLE_INSERT_FROZEN.
*/
CheckTableNotInUse(matviewRel, "refresh an IMMV incrementally");
/*
* Switch to the owner's userid, so that any functions are run as that
* user. Also arrange to make GUC variable changes local to this command.
* We will switch modes when we are about to execute user code.
*/
relowner = matviewRel->rd_rel->relowner;
GetUserIdAndSecContext(&save_userid, &save_sec_context);
SetUserIdAndSecContext(relowner,
save_sec_context | SECURITY_RESTRICTED_OPERATION);
save_nestlevel = NewGUCNestLevel();
#if defined(PG_VERSION_NUM) && (PG_VERSION_NUM >= 170000)
RestrictSearchPath();
#endif
/* get view query*/
query = get_immv_query(matviewRel);
/*
* When a base table is truncated, the view content will be empty if the
* view definition query does not contain an aggregate without a GROUP clause.
* Therefore, such views can be truncated.
*
* Aggregate views without a GROUP clause always have one row. Therefore,
* if a base table is truncated, the view will not be empty and will contain
* a row with NULL value (or 0 for count()). So, in this case, we refresh the
* view instead of truncating it.
*/
if (TRIGGER_FIRED_BY_TRUNCATE(trigdata->tg_event))
{
if (!(query->hasAggs && query->groupClause == NIL))
{
OpenImmvIncrementalMaintenance();
#if defined(PG_VERSION_NUM) && (PG_VERSION_NUM >= 160000)
ExecuteTruncateGuts(list_make1(matviewRel), list_make1_oid(matviewOid),
NIL, DROP_RESTRICT, false, false);
#else
ExecuteTruncateGuts(list_make1(matviewRel), list_make1_oid(matviewOid),
NIL, DROP_RESTRICT, false);
#endif
CloseImmvIncrementalMaintenance();
}
else
{
Oid OIDNewHeap;
DestReceiver *dest;
uint64 processed = 0;
Query *dataQuery = rewriteQueryForIMMV(query, NIL);
char relpersistence = matviewRel->rd_rel->relpersistence;
/*
* Create the transient table that will receive the regenerated data. Lock
* it against access by any other process until commit (by which time it
* will be gone).
*/
#if defined(PG_VERSION_NUM) && (PG_VERSION_NUM >= 150000)
OIDNewHeap = make_new_heap(matviewOid, matviewRel->rd_rel->reltablespace,
matviewRel->rd_rel->relam, relpersistence, ExclusiveLock);
#else
OIDNewHeap = make_new_heap(matviewOid, matviewRel->rd_rel->reltablespace,
relpersistence, ExclusiveLock);
#endif
LockRelationOid(OIDNewHeap, AccessExclusiveLock);
dest = CreateTransientRelDestReceiver(OIDNewHeap);
/* Generate the data */
processed = refresh_immv_datafill(dest, dataQuery, NULL, NULL, "");
refresh_by_heap_swap(matviewOid, OIDNewHeap, relpersistence);
/* Inform cumulative stats system about our activity */
pgstat_count_truncate(matviewRel);
pgstat_count_heap_insert(matviewRel, processed);
}
/* Clean up hash entry and delete tuplestores */
clean_up_IVM_hash_entry(entry, false);
/* Pop the original snapshot. */
PopActiveSnapshot();
table_close(matviewRel, NoLock);
/* Roll back any GUC changes */
AtEOXact_GUC(false, save_nestlevel);
/* Restore userid and security context */
SetUserIdAndSecContext(save_userid, save_sec_context);