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Commiteb7ed3f

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Allow UNIQUE indexes on partitioned tables
If we restrict unique constraints on partitioned tables so that theymust always include the partition key, then our standard approach tounique indexes already works --- each unique key is forced to existwithin a single partition, so enforcing the unique restriction in eachindex individually is enough to have it enforced globally. Therefore wecan implement unique indexes on partitions by simply removing a fewrestrictions (and adding others.)Discussion:https://postgr.es/m/20171222212921.hi6hg6pem2w2t36z@alvherre.pgsqlDiscussion:https://postgr.es/m/20171229230607.3iib6b62fn3uaf47@alvherre.pgsqlReviewed-by: Simon Riggs, Jesper Pedersen, Peter Eisentraut, JaimeCasanova, Amit Langote
1 parent524d64e commiteb7ed3f

27 files changed

+907
-95
lines changed

‎doc/src/sgml/ddl.sgml

Lines changed: 4 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -3146,9 +3146,8 @@ CREATE TABLE measurement_y2006m02 PARTITION OF measurement
31463146
<para>
31473147
Create an index on the key column(s), as well as any other indexes you
31483148
might want, on the partitioned table. (The key index is not strictly
3149-
necessary, but in most scenarios it is helpful. If you intend the key
3150-
values to be unique then you should always create a unique or
3151-
primary-key constraint for each partition.) This automatically creates
3149+
necessary, but in most scenarios it is helpful.)
3150+
This automatically creates
31523151
one index on each partition, and any partitions you create or attach
31533152
later will also contain the index.
31543153

@@ -3270,15 +3269,15 @@ ALTER TABLE measurement ATTACH PARTITION measurement_y2008m02
32703269
<itemizedlist>
32713270
<listitem>
32723271
<para>
3273-
There is no way to create a primary key, unique constraint, or
3272+
There is no way to create a
32743273
exclusion constraint spanning all partitions; it is only possible
32753274
to constrain each leaf partition individually.
32763275
</para>
32773276
</listitem>
32783277

32793278
<listitem>
32803279
<para>
3281-
Since primary keys are not supported on partitioned tables, foreign
3280+
While primary keys are supported on partitioned tables, foreign
32823281
keys referencing partitioned tables are not supported, nor are foreign
32833282
key references from a partitioned table to some other table.
32843283
</para>

‎doc/src/sgml/ref/alter_table.sgml

Lines changed: 11 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -412,6 +412,11 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
412412
disappear too.
413413
</para>
414414

415+
<para>
416+
Additional restrictions apply when unique or primary key constraints
417+
are added to partitioned tables; see <xref linkend="sql-createtable" />.
418+
</para>
419+
415420
<note>
416421
<para>
417422
Adding a constraint using an existing index can be helpful in
@@ -834,9 +839,9 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
834839
<para>
835840
This form attaches an existing table (which might itself be partitioned)
836841
as a partition of the target table. The table can be attached
837-
as a partition for specific values using <literal>FOR VALUES
838-
</literal>or as a default partition by using <literal>DEFAULT
839-
</literal>.For each index in the target table, a corresponding
842+
as a partition for specific values using <literal>FOR VALUES</literal>
843+
or as a default partition by using <literal>DEFAULT</literal>.
844+
For each index in the target table, a corresponding
840845
one will be created in the attached table; or, if an equivalent
841846
index already exists, will be attached to the target table's index,
842847
as if <command>ALTER INDEX ATTACH PARTITION</command> had been executed.
@@ -851,8 +856,10 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
851856
as the target table and no more; moreover, the column types must also
852857
match. Also, it must have all the <literal>NOT NULL</literal> and
853858
<literal>CHECK</literal> constraints of the target table. Currently
854-
<literal>UNIQUE</literal>, <literal>PRIMARY KEY</literal>, and
855859
<literal>FOREIGN KEY</literal> constraints are not considered.
860+
<literal>UNIQUE</literal> and <literal>PRIMARY KEY</literal> constraints
861+
from the parent table will be created in the partition, if they don't
862+
already exist.
856863
If any of the <literal>CHECK</literal> constraints of the table being
857864
attached is marked <literal>NO INHERIT</literal>, the command will fail;
858865
such a constraint must be recreated without the <literal>NO INHERIT</literal>

‎doc/src/sgml/ref/create_index.sgml

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -108,6 +108,11 @@ CREATE [ UNIQUE ] INDEX [ CONCURRENTLY ] [ [ IF NOT EXISTS ] <replaceable class=
108108
insert or update data which would result in duplicate entries
109109
will generate an error.
110110
</para>
111+
112+
<para>
113+
Additional restrictions apply when unique indexes are applied to
114+
partitioned tables; see <xref linkend="sql-createtable" />.
115+
</para>
111116
</listitem>
112117
</varlistentry>
113118

‎doc/src/sgml/ref/create_table.sgml

Lines changed: 16 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -546,8 +546,7 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
546546
</para>
547547

548548
<para>
549-
Partitioned tables do not support <literal>UNIQUE</literal>,
550-
<literal>PRIMARY KEY</literal>, <literal>EXCLUDE</literal>, or
549+
Partitioned tables do not support <literal>EXCLUDE</literal> or
551550
<literal>FOREIGN KEY</literal> constraints; however, you can define
552551
these constraints on individual partitions.
553552
</para>
@@ -786,6 +785,14 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
786785
primary key constraint defined for the table. (Otherwise it
787786
would just be the same constraint listed twice.)
788787
</para>
788+
789+
<para>
790+
When used on partitioned tables, unique constraints must include all the
791+
columns of the partition key.
792+
If any partitions are in turn partitioned, all columns of each partition
793+
key are considered at each level below the <literal>UNIQUE</literal>
794+
constraint.
795+
</para>
789796
</listitem>
790797
</varlistentry>
791798

@@ -814,6 +821,13 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
814821
about the design of the schema, since a primary key implies that other
815822
tables can rely on this set of columns as a unique identifier for rows.
816823
</para>
824+
825+
<para>
826+
<literal>PRIMARY KEY</literal> constraints share the restrictions that
827+
<literal>UNIQUE</literal> constraints have when placed on partitioned
828+
tables.
829+
</para>
830+
817831
</listitem>
818832
</varlistentry>
819833

‎src/backend/bootstrap/bootparse.y

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -322,6 +322,7 @@ Boot_DeclareIndexStmt:
322322
stmt,
323323
$4,
324324
InvalidOid,
325+
InvalidOid,
325326
false,
326327
false,
327328
false,
@@ -367,6 +368,7 @@ Boot_DeclareUniqueIndexStmt:
367368
stmt,
368369
$5,
369370
InvalidOid,
371+
InvalidOid,
370372
false,
371373
false,
372374
false,

‎src/backend/catalog/index.c

Lines changed: 45 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -691,6 +691,8 @@ UpdateIndexRelation(Oid indexoid,
691691
*nonzero to specify a preselected OID.
692692
* parentIndexRelid: if creating an index partition, the OID of the
693693
*parent index; otherwise InvalidOid.
694+
* parentConstraintId: if creating a constraint on a partition, the OID
695+
*of the constraint in the parent; otherwise InvalidOid.
694696
* relFileNode: normally, pass InvalidOid to get new storage. May be
695697
*nonzero to attach an existing valid build.
696698
* indexInfo: same info executor uses to insert into the index
@@ -722,6 +724,7 @@ UpdateIndexRelation(Oid indexoid,
722724
*(only if INDEX_CREATE_ADD_CONSTRAINT is set)
723725
* allow_system_table_mods: allow table to be a system catalog
724726
* is_internal: if true, post creation hook for new index
727+
* constraintId: if not NULL, receives OID of created constraint
725728
*
726729
* Returns the OID of the created index.
727730
*/
@@ -730,6 +733,7 @@ index_create(Relation heapRelation,
730733
constchar*indexRelationName,
731734
OidindexRelationId,
732735
OidparentIndexRelid,
736+
OidparentConstraintId,
733737
OidrelFileNode,
734738
IndexInfo*indexInfo,
735739
List*indexColNames,
@@ -742,7 +746,8 @@ index_create(Relation heapRelation,
742746
bits16flags,
743747
bits16constr_flags,
744748
boolallow_system_table_mods,
745-
boolis_internal)
749+
boolis_internal,
750+
Oid*constraintId)
746751
{
747752
OidheapRelationId=RelationGetRelid(heapRelation);
748753
Relationpg_class;
@@ -989,6 +994,7 @@ index_create(Relation heapRelation,
989994
if ((flags&INDEX_CREATE_ADD_CONSTRAINT)!=0)
990995
{
991996
charconstraintType;
997+
ObjectAddresslocaladdr;
992998

993999
if (isprimary)
9941000
constraintType=CONSTRAINT_PRIMARY;
@@ -1002,14 +1008,17 @@ index_create(Relation heapRelation,
10021008
constraintType=0;/* keep compiler quiet */
10031009
}
10041010

1005-
index_constraint_create(heapRelation,
1011+
localaddr=index_constraint_create(heapRelation,
10061012
indexRelationId,
1013+
parentConstraintId,
10071014
indexInfo,
10081015
indexRelationName,
10091016
constraintType,
10101017
constr_flags,
10111018
allow_system_table_mods,
10121019
is_internal);
1020+
if (constraintId)
1021+
*constraintId=localaddr.objectId;
10131022
}
10141023
else
10151024
{
@@ -1181,6 +1190,8 @@ index_create(Relation heapRelation,
11811190
*
11821191
* heapRelation: table owning the index (must be suitably locked by caller)
11831192
* indexRelationId: OID of the index
1193+
* parentConstraintId: if constraint is on a partition, the OID of the
1194+
*constraint in the parent.
11841195
* indexInfo: same info executor uses to insert into the index
11851196
* constraintName: what it say (generally, should match name of index)
11861197
* constraintType: one of CONSTRAINT_PRIMARY, CONSTRAINT_UNIQUE, or
@@ -1198,6 +1209,7 @@ index_create(Relation heapRelation,
11981209
ObjectAddress
11991210
index_constraint_create(RelationheapRelation,
12001211
OidindexRelationId,
1212+
OidparentConstraintId,
12011213
IndexInfo*indexInfo,
12021214
constchar*constraintName,
12031215
charconstraintType,
@@ -1212,6 +1224,9 @@ index_constraint_create(Relation heapRelation,
12121224
booldeferrable;
12131225
boolinitdeferred;
12141226
boolmark_as_primary;
1227+
boolislocal;
1228+
boolnoinherit;
1229+
intinhcount;
12151230

12161231
deferrable= (constr_flags&INDEX_CONSTR_CREATE_DEFERRABLE)!=0;
12171232
initdeferred= (constr_flags&INDEX_CONSTR_CREATE_INIT_DEFERRED)!=0;
@@ -1246,6 +1261,19 @@ index_constraint_create(Relation heapRelation,
12461261
deleteDependencyRecordsForClass(RelationRelationId,indexRelationId,
12471262
RelationRelationId,DEPENDENCY_AUTO);
12481263

1264+
if (OidIsValid(parentConstraintId))
1265+
{
1266+
islocal= false;
1267+
inhcount=1;
1268+
noinherit= false;
1269+
}
1270+
else
1271+
{
1272+
islocal= true;
1273+
inhcount=0;
1274+
noinherit= true;
1275+
}
1276+
12491277
/*
12501278
* Construct a pg_constraint entry.
12511279
*/
@@ -1273,9 +1301,9 @@ index_constraint_create(Relation heapRelation,
12731301
NULL,/* no check constraint */
12741302
NULL,
12751303
NULL,
1276-
true,/*islocal */
1277-
0,/*inhcount */
1278-
true,/*noinherit */
1304+
islocal,
1305+
inhcount,
1306+
noinherit,
12791307
is_internal);
12801308

12811309
/*
@@ -1294,6 +1322,18 @@ index_constraint_create(Relation heapRelation,
12941322

12951323
recordDependencyOn(&myself,&referenced,DEPENDENCY_INTERNAL);
12961324

1325+
/*
1326+
* Also, if this is a constraint on a partition, mark it as depending
1327+
* on the constraint in the parent.
1328+
*/
1329+
if (OidIsValid(parentConstraintId))
1330+
{
1331+
ObjectAddressparentConstr;
1332+
1333+
ObjectAddressSet(parentConstr,ConstraintRelationId,parentConstraintId);
1334+
recordDependencyOn(&referenced,&parentConstr,DEPENDENCY_INTERNAL_AUTO);
1335+
}
1336+
12971337
/*
12981338
* If the constraint is deferrable, create the deferred uniqueness
12991339
* checking trigger. (The trigger will be given an internal dependency on

‎src/backend/catalog/pg_constraint.c

Lines changed: 76 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -747,6 +747,43 @@ AlterConstraintNamespaces(Oid ownerId, Oid oldNspId,
747747
heap_close(conRel,RowExclusiveLock);
748748
}
749749

750+
/*
751+
* ConstraintSetParentConstraint
752+
*Set a partition's constraint as child of its parent table's
753+
*
754+
* This updates the constraint's pg_constraint row to show it as inherited, and
755+
* add a dependency to the parent so that it cannot be removed on its own.
756+
*/
757+
void
758+
ConstraintSetParentConstraint(OidchildConstrId,OidparentConstrId)
759+
{
760+
RelationconstrRel;
761+
Form_pg_constraintconstrForm;
762+
HeapTupletuple,
763+
newtup;
764+
ObjectAddressdepender;
765+
ObjectAddressreferenced;
766+
767+
constrRel=heap_open(ConstraintRelationId,RowExclusiveLock);
768+
tuple=SearchSysCache1(CONSTROID,ObjectIdGetDatum(childConstrId));
769+
if (!HeapTupleIsValid(tuple))
770+
elog(ERROR,"cache lookup failed for constraint %u",childConstrId);
771+
newtup=heap_copytuple(tuple);
772+
constrForm= (Form_pg_constraint)GETSTRUCT(newtup);
773+
constrForm->conislocal= false;
774+
constrForm->coninhcount++;
775+
CatalogTupleUpdate(constrRel,&tuple->t_self,newtup);
776+
ReleaseSysCache(tuple);
777+
778+
ObjectAddressSet(referenced,ConstraintRelationId,parentConstrId);
779+
ObjectAddressSet(depender,ConstraintRelationId,childConstrId);
780+
781+
recordDependencyOn(&depender,&referenced,DEPENDENCY_INTERNAL_AUTO);
782+
783+
heap_close(constrRel,RowExclusiveLock);
784+
}
785+
786+
750787
/*
751788
* get_relation_constraint_oid
752789
*Find a constraint on the specified relation with the specified name.
@@ -903,6 +940,45 @@ get_relation_constraint_attnos(Oid relid, const char *conname,
903940
returnconattnos;
904941
}
905942

943+
/*
944+
* Return the OID of the constraint associated with the given index in the
945+
* given relation; or InvalidOid if no such index is catalogued.
946+
*/
947+
Oid
948+
get_relation_idx_constraint_oid(OidrelationId,OidindexId)
949+
{
950+
Relationpg_constraint;
951+
SysScanDescscan;
952+
ScanKeyDatakey;
953+
HeapTupletuple;
954+
OidconstraintId=InvalidOid;
955+
956+
pg_constraint=heap_open(ConstraintRelationId,AccessShareLock);
957+
958+
ScanKeyInit(&key,
959+
Anum_pg_constraint_conrelid,
960+
BTEqualStrategyNumber,
961+
F_OIDEQ,
962+
ObjectIdGetDatum(relationId));
963+
scan=systable_beginscan(pg_constraint,ConstraintRelidIndexId,
964+
true,NULL,1,&key);
965+
while ((tuple=systable_getnext(scan))!=NULL)
966+
{
967+
Form_pg_constraintconstrForm;
968+
969+
constrForm= (Form_pg_constraint)GETSTRUCT(tuple);
970+
if (constrForm->conindid==indexId)
971+
{
972+
constraintId=HeapTupleGetOid(tuple);
973+
break;
974+
}
975+
}
976+
systable_endscan(scan);
977+
978+
heap_close(pg_constraint,AccessShareLock);
979+
returnconstraintId;
980+
}
981+
906982
/*
907983
* get_domain_constraint_oid
908984
*Find a constraint on the specified domain with the specified name.

‎src/backend/catalog/toasting.c

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -330,13 +330,13 @@ create_toast_table(Relation rel, Oid toastOid, Oid toastIndexOid,
330330
coloptions[1]=0;
331331

332332
index_create(toast_rel,toast_idxname,toastIndexOid,InvalidOid,
333-
InvalidOid,
333+
InvalidOid,InvalidOid,
334334
indexInfo,
335335
list_make2("chunk_id","chunk_seq"),
336336
BTREE_AM_OID,
337337
rel->rd_rel->reltablespace,
338338
collationObjectId,classObjectId,coloptions, (Datum)0,
339-
INDEX_CREATE_IS_PRIMARY,0, true, true);
339+
INDEX_CREATE_IS_PRIMARY,0, true, true,NULL);
340340

341341
heap_close(toast_rel,NoLock);
342342

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