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Commit015e889

Browse files
Load FK defs into relcache for use by planner
Fastpath ignores this if no triggers defined.Author: Tomas Vondra, with fastpath and comments added by meReviewers: David Rowley, Simon Riggs
1 parentf2b1b30 commit015e889

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7 files changed

+199
-1
lines changed

7 files changed

+199
-1
lines changed

‎src/backend/nodes/outfuncs.c

Lines changed: 13 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -2137,6 +2137,16 @@ _outIndexOptInfo(StringInfo str, const IndexOptInfo *node)
21372137
/* we don't bother with fields copied from the index AM's API struct */
21382138
}
21392139

2140+
staticvoid
2141+
_outForeignKeyOptInfo(StringInfostr,constForeignKeyOptInfo*node)
2142+
{
2143+
WRITE_NODE_TYPE("FOREIGNKEYOPTINFO");
2144+
2145+
WRITE_OID_FIELD(conrelid);
2146+
WRITE_OID_FIELD(confrelid);
2147+
WRITE_INT_FIELD(nkeys);
2148+
}
2149+
21402150
staticvoid
21412151
_outEquivalenceClass(StringInfostr,constEquivalenceClass*node)
21422152
{
@@ -3607,6 +3617,9 @@ _outNode(StringInfo str, const void *obj)
36073617
caseT_IndexOptInfo:
36083618
_outIndexOptInfo(str,obj);
36093619
break;
3620+
caseT_ForeignKeyOptInfo:
3621+
_outForeignKeyOptInfo(str,obj);
3622+
break;
36103623
caseT_EquivalenceClass:
36113624
_outEquivalenceClass(str,obj);
36123625
break;

‎src/backend/optimizer/util/plancat.c

Lines changed: 84 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -28,6 +28,7 @@
2828
#include"catalog/dependency.h"
2929
#include"catalog/heap.h"
3030
#include"catalog/pg_am.h"
31+
#include"catalog/pg_constraint.h"
3132
#include"foreign/fdwapi.h"
3233
#include"miscadmin.h"
3334
#include"nodes/makefuncs.h"
@@ -41,6 +42,7 @@
4142
#include"rewrite/rewriteManip.h"
4243
#include"storage/bufmgr.h"
4344
#include"utils/lsyscache.h"
45+
#include"utils/syscache.h"
4446
#include"utils/rel.h"
4547
#include"utils/snapmgr.h"
4648

@@ -94,6 +96,9 @@ get_relation_info(PlannerInfo *root, Oid relationObjectId, bool inhparent,
9496
Relationrelation;
9597
boolhasindex;
9698
List*indexinfos=NIL;
99+
List*fkinfos=NIL;
100+
List*fkoidlist;
101+
ListCell*l;
97102

98103
/*
99104
* We need not lock the relation since it was already locked, either by
@@ -141,7 +146,6 @@ get_relation_info(PlannerInfo *root, Oid relationObjectId, bool inhparent,
141146
if (hasindex)
142147
{
143148
List*indexoidlist;
144-
ListCell*l;
145149
LOCKMODElmode;
146150

147151
indexoidlist=RelationGetIndexList(relation);
@@ -388,6 +392,85 @@ get_relation_info(PlannerInfo *root, Oid relationObjectId, bool inhparent,
388392

389393
rel->indexlist=indexinfos;
390394

395+
/*
396+
* Load foreign key data. Note this is the definitional data from the
397+
* catalog only and does not lock the referenced tables here. The
398+
* precise definition of the FK is important and may affect the usage
399+
* elsewhere in the planner, e.g. if the constraint is deferred or
400+
* if the constraint is not valid then relying upon this in the executor
401+
* may not be accurate, though might be considered a useful estimate for
402+
* planning purposes.
403+
*/
404+
fkoidlist=RelationGetFKeyList(relation);
405+
406+
foreach(l,fkoidlist)
407+
{
408+
inti;
409+
ArrayType*arr;
410+
Datumadatum;
411+
boolisnull;
412+
intnumkeys;
413+
Oidfkoid=lfirst_oid(l);
414+
415+
HeapTuplehtup=SearchSysCache1(CONSTROID,ObjectIdGetDatum(fkoid));
416+
Form_pg_constraintconstraint= (Form_pg_constraint)GETSTRUCT(htup);
417+
418+
ForeignKeyOptInfo*info;
419+
420+
Assert(constraint->contype==CONSTRAINT_FOREIGN);
421+
422+
info=makeNode(ForeignKeyOptInfo);
423+
424+
info->conrelid=constraint->conrelid;
425+
info->confrelid=constraint->confrelid;
426+
427+
/* conkey */
428+
adatum=SysCacheGetAttr(CONSTROID,htup,
429+
Anum_pg_constraint_conkey,&isnull);
430+
Assert(!isnull);
431+
432+
arr=DatumGetArrayTypeP(adatum);
433+
numkeys=ARR_DIMS(arr)[0];
434+
info->conkeys= (int*)palloc0(numkeys*sizeof(int));
435+
436+
for (i=0;i<numkeys;i++)
437+
info->conkeys[i]= ((int16*)ARR_DATA_PTR(arr))[i];
438+
439+
/* confkey */
440+
adatum=SysCacheGetAttr(CONSTROID,htup,
441+
Anum_pg_constraint_confkey,&isnull);
442+
Assert(!isnull);
443+
444+
arr=DatumGetArrayTypeP(adatum);
445+
numkeys=ARR_DIMS(arr)[0];
446+
info->confkeys= (int*)palloc0(numkeys*sizeof(int));
447+
448+
for (i=0;i<numkeys;i++)
449+
info->confkeys[i]= ((int16*)ARR_DATA_PTR(arr))[i];
450+
451+
/* conpfeqop */
452+
adatum=SysCacheGetAttr(CONSTROID,htup,
453+
Anum_pg_constraint_conpfeqop,&isnull);
454+
Assert(!isnull);
455+
456+
arr=DatumGetArrayTypeP(adatum);
457+
numkeys=ARR_DIMS(arr)[0];
458+
info->conpfeqop= (Oid*)palloc0(numkeys*sizeof(Oid));
459+
460+
for (i=0;i<numkeys;i++)
461+
info->conpfeqop[i]= ((Oid*)ARR_DATA_PTR(arr))[i];
462+
463+
info->nkeys=numkeys;
464+
465+
ReleaseSysCache(htup);
466+
467+
fkinfos=lcons(info,fkinfos);
468+
}
469+
470+
list_free(fkoidlist);
471+
472+
rel->fkeylist=fkinfos;
473+
391474
/* Grab foreign-table info using the relcache, while we have it */
392475
if (relation->rd_rel->relkind==RELKIND_FOREIGN_TABLE)
393476
{

‎src/backend/utils/cache/relcache.c

Lines changed: 75 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -2031,6 +2031,7 @@ RelationDestroyRelation(Relation relation, bool remember_tupdesc)
20312031
FreeTupleDesc(relation->rd_att);
20322032
}
20332033
list_free(relation->rd_indexlist);
2034+
list_free(relation->rd_fkeylist);
20342035
bms_free(relation->rd_indexattr);
20352036
bms_free(relation->rd_keyattr);
20362037
bms_free(relation->rd_idattr);
@@ -3956,6 +3957,79 @@ RelationGetIndexList(Relation relation)
39563957
returnresult;
39573958
}
39583959

3960+
/*
3961+
* RelationGetFKeyList -- get a list of foreign key oids
3962+
*
3963+
* Use an index scan on pg_constraint to load in FK definitions,
3964+
* intended for use within the planner, not for enforcing FKs.
3965+
*
3966+
* Data is ordered by Oid, though this is not critical at this point
3967+
* since we do not lock the referenced relations.
3968+
*/
3969+
List*
3970+
RelationGetFKeyList(Relationrelation)
3971+
{
3972+
Relationconrel;
3973+
SysScanDescconscan;
3974+
ScanKeyDataskey;
3975+
HeapTuplehtup;
3976+
List*result;
3977+
List*oldlist;
3978+
MemoryContextoldcxt;
3979+
3980+
/* Quick exit if we already computed the list. */
3981+
if (relation->rd_fkeylist)
3982+
returnlist_copy(relation->rd_fkeylist);
3983+
3984+
/* Fast path if no FKs... if it doesn't have a trigger, it can't have a FK */
3985+
if (!relation->rd_rel->relhastriggers)
3986+
returnNIL;
3987+
/*
3988+
* We build the list we intend to return (in the caller's context) while
3989+
* doing the scan. After successfully completing the scan, we copy that
3990+
* list into the relcache entry. This avoids cache-context memory leakage
3991+
* if we get some sort of error partway through.
3992+
*/
3993+
result=NIL;
3994+
3995+
/* Prepare to scan pg_constraint for entries having conrelid = this rel. */
3996+
ScanKeyInit(&skey,
3997+
Anum_pg_constraint_conrelid,
3998+
BTEqualStrategyNumber,F_OIDEQ,
3999+
ObjectIdGetDatum(RelationGetRelid(relation)));
4000+
4001+
conrel=heap_open(ConstraintRelationId,AccessShareLock);
4002+
conscan=systable_beginscan(conrel,ConstraintRelidIndexId, true,
4003+
NULL,1,&skey);
4004+
4005+
while (HeapTupleIsValid(htup=systable_getnext(conscan)))
4006+
{
4007+
Form_pg_constraintconstraint= (Form_pg_constraint)GETSTRUCT(htup);
4008+
4009+
/* return only foreign keys */
4010+
if (constraint->contype!=CONSTRAINT_FOREIGN)
4011+
continue;
4012+
4013+
/* Add FK's OID to result list in the proper order */
4014+
result=insert_ordered_oid(result,HeapTupleGetOid(htup));
4015+
}
4016+
4017+
systable_endscan(conscan);
4018+
4019+
heap_close(conrel,AccessShareLock);
4020+
4021+
/* Now save a copy of the completed list in the relcache entry. */
4022+
oldcxt=MemoryContextSwitchTo(CacheMemoryContext);
4023+
oldlist=relation->rd_fkeylist;
4024+
relation->rd_fkeylist=list_copy(result);
4025+
MemoryContextSwitchTo(oldcxt);
4026+
4027+
/* Don't leak the old list, if there is one */
4028+
list_free(oldlist);
4029+
4030+
returnresult;
4031+
}
4032+
39594033
/*
39604034
* insert_ordered_oid
39614035
*Insert a new Oid into a sorted list of Oids, preserving ordering
@@ -4920,6 +4994,7 @@ load_relcache_init_file(bool shared)
49204994
rel->rd_indexattr=NULL;
49214995
rel->rd_keyattr=NULL;
49224996
rel->rd_idattr=NULL;
4997+
rel->rd_fkeylist=NIL;
49234998
rel->rd_createSubid=InvalidSubTransactionId;
49244999
rel->rd_newRelfilenodeSubid=InvalidSubTransactionId;
49255000
rel->rd_amcache=NULL;

‎src/include/nodes/nodes.h

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -223,6 +223,7 @@ typedef enum NodeTag
223223
T_PlannerGlobal,
224224
T_RelOptInfo,
225225
T_IndexOptInfo,
226+
T_ForeignKeyOptInfo,
226227
T_ParamPathInfo,
227228
T_Path,
228229
T_IndexPath,

‎src/include/nodes/relation.h

Lines changed: 22 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -516,6 +516,7 @@ typedef struct RelOptInfo
516516
List*lateral_vars;/* LATERAL Vars and PHVs referenced by rel */
517517
Relidslateral_referencers;/* rels that reference me laterally */
518518
List*indexlist;/* list of IndexOptInfo */
519+
List*fkeylist;/* list of ForeignKeyOptInfo */
519520
BlockNumberpages;/* size estimates derived from pg_class */
520521
doubletuples;
521522
doubleallvisfrac;
@@ -621,6 +622,27 @@ typedef struct IndexOptInfo
621622
void(*amcostestimate) ();/* AM's cost estimator */
622623
}IndexOptInfo;
623624

625+
/*
626+
* ForeignKeyOptInfo
627+
*Per-foreign-key information for planning/optimization
628+
*
629+
* Only includes columns from pg_constraint related to foreign keys.
630+
*
631+
* conkeys[], confkeys[] and conpfeqop[] each have nkeys entries.
632+
*/
633+
typedefstructForeignKeyOptInfo
634+
{
635+
NodeTagtype;
636+
637+
Oidconrelid;/* relation constrained by the foreign key */
638+
Oidconfrelid;/* relation referenced by the foreign key */
639+
640+
intnkeys;/* number of columns in the foreign key */
641+
int*conkeys;/* attnums of columns in the constrained table */
642+
int*confkeys;/* attnums of columns in the referenced table */
643+
Oid*conpfeqop;/* OIDs of equality operators used by the FK */
644+
645+
}ForeignKeyOptInfo;
624646

625647
/*
626648
* EquivalenceClasses

‎src/include/utils/rel.h

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -94,6 +94,9 @@ typedef struct RelationData
9494
Oidrd_oidindex;/* OID of unique index on OID, if any */
9595
Oidrd_replidindex;/* OID of replica identity index, if any */
9696

97+
/* data managed by RelationGetFKList: */
98+
List*rd_fkeylist;/* OIDs of foreign keys */
99+
97100
/* data managed by RelationGetIndexAttrBitmap: */
98101
Bitmapset*rd_indexattr;/* identifies columns used in indexes */
99102
Bitmapset*rd_keyattr;/* cols that can be ref'd by foreign keys */

‎src/include/utils/relcache.h

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -38,6 +38,7 @@ extern void RelationClose(Relation relation);
3838
* Routines to compute/retrieve additional cached information
3939
*/
4040
externList*RelationGetIndexList(Relationrelation);
41+
externList*RelationGetFKeyList(Relationrelation);
4142
externOidRelationGetOidIndex(Relationrelation);
4243
externOidRelationGetReplicaIndex(Relationrelation);
4344
externList*RelationGetIndexExpressions(Relationrelation);

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