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Add SysCacheGetAttrNotNull for guaranteed not-null attrs

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When extracting an attr from a cached tuple in the syscache with
SysCacheGetAttr the isnull parameter must be checked in case the
attr cannot be NULL.  For cases when this is known beforehand, a
wrapper is introduced which perform the errorhandling internally
on behalf of the caller, invoking an elog in case of a NULL attr.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Peter Eisentraut <peter.eisentraut@enterprisedb.com>
Reviewed-by: David Rowley <dgrowleyml@gmail.com>
Discussion: https://postgr.es/m/AD76405E-DB45-46B6-941F-17B1EB3A9076@yesql.se
This commit is contained in:
Daniel Gustafsson
2023-03-25 22:49:33 +01:00
parent e33967b13b
commit d435f15fff
38 changed files with 232 additions and 452 deletions
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27
src/backend/commands/tablecmds.c
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@ -11116,7 +11116,6 @@ ATExecValidateConstraint(List **wqueue, Relation rel, char *constrName,
List *children = NIL;
ListCell *child;
NewConstraint *newcon;
bool isnull;
Datum val;
char *conbin;
@ -11171,11 +11170,8 @@ ATExecValidateConstraint(List **wqueue, Relation rel, char *constrName,
newcon->refindid = InvalidOid;
newcon->conid = con->oid;
val = SysCacheGetAttr(CONSTROID, tuple,
Anum_pg_constraint_conbin, &isnull);
if (isnull)
elog(ERROR, "null conbin for constraint %u", con->oid);
val = SysCacheGetAttrNotNull(CONSTROID, tuple,
Anum_pg_constraint_conbin);
conbin = TextDatumGetCString(val);
newcon->qual = (Node *) stringToNode(conbin);
@ -11277,7 +11273,6 @@ transformFkeyGetPrimaryKey(Relation pkrel, Oid *indexOid,
HeapTuple indexTuple = NULL;
Form_pg_index indexStruct = NULL;
Datum indclassDatum;
bool isnull;
oidvector *indclass;
int i;
@ -11329,9 +11324,8 @@ transformFkeyGetPrimaryKey(Relation pkrel, Oid *indexOid,
RelationGetRelationName(pkrel))));
/* Must get indclass the hard way */
indclassDatum = SysCacheGetAttr(INDEXRELID, indexTuple,
Anum_pg_index_indclass, &isnull);
Assert(!isnull);
indclassDatum = SysCacheGetAttrNotNull(INDEXRELID, indexTuple,
Anum_pg_index_indclass);
indclass = (oidvector *) DatumGetPointer(indclassDatum);
/*
@ -11424,13 +11418,11 @@ transformFkeyCheckAttrs(Relation pkrel,
heap_attisnull(indexTuple, Anum_pg_index_indexprs, NULL))
{
Datum indclassDatum;
bool isnull;
oidvector *indclass;
/* Must get indclass the hard way */
indclassDatum = SysCacheGetAttr(INDEXRELID, indexTuple,
Anum_pg_index_indclass, &isnull);
Assert(!isnull);
indclassDatum = SysCacheGetAttrNotNull(INDEXRELID, indexTuple,
Anum_pg_index_indclass);
indclass = (oidvector *) DatumGetPointer(indclassDatum);
/*
@ -13582,7 +13574,6 @@ TryReuseForeignKey(Oid oldId, Constraint *con)
{
HeapTuple tup;
Datum adatum;
bool isNull;
ArrayType *arr;
Oid *rawarr;
int numkeys;
@ -13595,10 +13586,8 @@ TryReuseForeignKey(Oid oldId, Constraint *con)
if (!HeapTupleIsValid(tup)) /* should not happen */
elog(ERROR, "cache lookup failed for constraint %u", oldId);
adatum = SysCacheGetAttr(CONSTROID, tup,
Anum_pg_constraint_conpfeqop, &isNull);
if (isNull)
elog(ERROR, "null conpfeqop for constraint %u", oldId);
adatum = SysCacheGetAttrNotNull(CONSTROID, tup,
Anum_pg_constraint_conpfeqop);
arr = DatumGetArrayTypeP(adatum); /* ensure not toasted */
numkeys = ARR_DIMS(arr)[0];
/* test follows the one in ri_FetchConstraintInfo() */