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Load FK defs into relcache for use by planner

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Fastpath ignores this if no triggers defined.

Author: Tomas Vondra, with fastpath and comments added by me
Reviewers: David Rowley, Simon Riggs
This commit is contained in:
Simon Riggs
2016-04-07 12:08:33 +01:00
parent f2b1b3079c
commit 015e88942a
7 changed files with 199 additions and 1 deletions
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85
src/backend/optimizer/util/plancat.c
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@ -28,6 +28,7 @@
#include "catalog/dependency.h"
#include "catalog/heap.h"
#include "catalog/pg_am.h"
#include "catalog/pg_constraint.h"
#include "foreign/fdwapi.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
@ -41,6 +42,7 @@
#include "rewrite/rewriteManip.h"
#include "storage/bufmgr.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
#include "utils/rel.h"
#include "utils/snapmgr.h"
@ -94,6 +96,9 @@ get_relation_info(PlannerInfo *root, Oid relationObjectId, bool inhparent,
Relation relation;
bool hasindex;
List *indexinfos = NIL;
List *fkinfos = NIL;
List *fkoidlist;
ListCell *l;
/*
* 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,
if (hasindex)
{
List *indexoidlist;
ListCell *l;
LOCKMODE lmode;
indexoidlist = RelationGetIndexList(relation);
@ -388,6 +392,85 @@ get_relation_info(PlannerInfo *root, Oid relationObjectId, bool inhparent,
rel->indexlist = indexinfos;
/*
* Load foreign key data. Note this is the definitional data from the
* catalog only and does not lock the referenced tables here. The
* precise definition of the FK is important and may affect the usage
* elsewhere in the planner, e.g. if the constraint is deferred or
* if the constraint is not valid then relying upon this in the executor
* may not be accurate, though might be considered a useful estimate for
* planning purposes.
*/
fkoidlist = RelationGetFKeyList(relation);
foreach(l, fkoidlist)
{
int i;
ArrayType *arr;
Datum adatum;
bool isnull;
int numkeys;
Oid fkoid = lfirst_oid(l);
HeapTuple htup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(fkoid));
Form_pg_constraint constraint = (Form_pg_constraint) GETSTRUCT(htup);
ForeignKeyOptInfo *info;
Assert(constraint->contype == CONSTRAINT_FOREIGN);
info = makeNode(ForeignKeyOptInfo);
info->conrelid = constraint->conrelid;
info->confrelid = constraint->confrelid;
/* conkey */
adatum = SysCacheGetAttr(CONSTROID, htup,
Anum_pg_constraint_conkey, &isnull);
Assert(!isnull);
arr = DatumGetArrayTypeP(adatum);
numkeys = ARR_DIMS(arr)[0];
info->conkeys = (int*)palloc0(numkeys * sizeof(int));
for (i = 0; i < numkeys; i++)
info->conkeys[i] = ((int16 *) ARR_DATA_PTR(arr))[i];
/* confkey */
adatum = SysCacheGetAttr(CONSTROID, htup,
Anum_pg_constraint_confkey, &isnull);
Assert(!isnull);
arr = DatumGetArrayTypeP(adatum);
numkeys = ARR_DIMS(arr)[0];
info->confkeys = (int*)palloc0(numkeys * sizeof(int));
for (i = 0; i < numkeys; i++)
info->confkeys[i] = ((int16 *) ARR_DATA_PTR(arr))[i];
/* conpfeqop */
adatum = SysCacheGetAttr(CONSTROID, htup,
Anum_pg_constraint_conpfeqop, &isnull);
Assert(!isnull);
arr = DatumGetArrayTypeP(adatum);
numkeys = ARR_DIMS(arr)[0];
info->conpfeqop = (Oid*)palloc0(numkeys * sizeof(Oid));
for (i = 0; i < numkeys; i++)
info->conpfeqop[i] = ((Oid *) ARR_DATA_PTR(arr))[i];
info->nkeys = numkeys;
ReleaseSysCache(htup);
fkinfos = lcons(info, fkinfos);
}
list_free(fkoidlist);
rel->fkeylist = fkinfos;
/* Grab foreign-table info using the relcache, while we have it */
if (relation->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
{