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Fix StoreCatalogInheritance1 to use 32bit inhseqno

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For no apparent reason, this function was using a 16bit-wide inhseqno
value, rather than the correct 32 bit width which is what is stored in
the pg_inherits catalog.  This becomes evident if you try to create a
table with more than 65535 parents, because this error appears:

ERROR:  duplicate key value violates unique constraint «pg_inherits_relid_seqno_index»
DETAIL:  Key (inhrelid, inhseqno)=(329371, 0) already exists.

Needless to say, having so many parents is an uncommon situations, which
explains why this error has never been reported despite being having
been introduced with the Postgres95 1.01 sources in commit d31084e9d111:
https://git.postgresql.org/gitweb/?p=postgresql.git;a=blob;f=src/backend/commands/creatinh.c;hb=d31084e9d111#l349

Backpatch all the way back.

David Rowley noticed this while reviewing a patch of mine.
Discussion: https://postgr.es/m/CAKJS1f8Dn7swSEhOWwzZzssW7747YB=2Hi+T7uGud40dur69-g@mail.gmail.com
This commit is contained in:
Alvaro Herrera 2018-01-19 10:15:08 -03:00
parent 29d58fd3ad
commit 1ef61ddce9
1 changed files with 4 additions and 4 deletions
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8
src/backend/commands/tablecmds.c
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@ -303,7 +303,7 @@ static void MergeConstraintsIntoExisting(Relation child_rel, Relation parent_rel
static void StoreCatalogInheritance(Oid relationId, List *supers,
bool child_is_partition);
static void StoreCatalogInheritance1(Oid relationId, Oid parentOid,
int16 seqNumber, Relation inhRelation,
int32 seqNumber, Relation inhRelation,
bool child_is_partition);
static int findAttrByName(const char *attributeName, List *schema);
static void AlterIndexNamespaces(Relation classRel, Relation rel,
@ -2352,7 +2352,7 @@ StoreCatalogInheritance(Oid relationId, List *supers,
bool child_is_partition)
{
Relation relation;
int16 seqNumber;
int32 seqNumber;
ListCell *entry;
/*
@ -2393,7 +2393,7 @@ StoreCatalogInheritance(Oid relationId, List *supers,
*/
static void
StoreCatalogInheritance1(Oid relationId, Oid parentOid,
int16 seqNumber, Relation inhRelation,
int32 seqNumber, Relation inhRelation,
bool child_is_partition)
{
TupleDesc desc = RelationGetDescr(inhRelation);
@ -2408,7 +2408,7 @@ StoreCatalogInheritance1(Oid relationId, Oid parentOid,
*/
values[Anum_pg_inherits_inhrelid - 1] = ObjectIdGetDatum(relationId);
values[Anum_pg_inherits_inhparent - 1] = ObjectIdGetDatum(parentOid);
values[Anum_pg_inherits_inhseqno - 1] = Int16GetDatum(seqNumber);
values[Anum_pg_inherits_inhseqno - 1] = Int32GetDatum(seqNumber);
memset(nulls, 0, sizeof(nulls));