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Add the notion of REPLICA IDENTITY for a table.

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Pending patches for logical replication will use this to determine
which columns of a tuple ought to be considered as its candidate key.

Andres Freund, with minor, mostly cosmetic adjustments by me
This commit is contained in:
Robert Haas
2013-11-08 12:30:43 -05:00
parent b97ee66cc1
commit 07cacba983
23 changed files with 902 additions and 49 deletions
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53
src/backend/utils/cache/relcache.c vendored
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@ -1454,6 +1454,7 @@ formrdesc(const char *relationName, Oid relationReltype,
/* ... and they're always populated, too */
relation->rd_rel->relispopulated = true;
relation->rd_rel->relreplident = REPLICA_IDENTITY_NOTHING;
relation->rd_rel->relpages = 0;
relation->rd_rel->reltuples = 0;
relation->rd_rel->relallvisible = 0;
@ -2664,6 +2665,13 @@ RelationBuildLocalRelation(const char *relname,
else
rel->rd_rel->relispopulated = true;
/* system relations and non-table objects don't have one */
if (!IsSystemNamespace(relnamespace) &&
(relkind == RELKIND_RELATION || relkind == RELKIND_MATVIEW))
rel->rd_rel->relreplident = REPLICA_IDENTITY_DEFAULT;
else
rel->rd_rel->relreplident = REPLICA_IDENTITY_NOTHING;
/*
* Insert relation physical and logical identifiers (OIDs) into the right
* places. For a mapped relation, we set relfilenode to zero and rely on
@ -3462,7 +3470,10 @@ RelationGetIndexList(Relation relation)
ScanKeyData skey;
HeapTuple htup;
List *result;
Oid oidIndex;
char replident = relation->rd_rel->relreplident;
Oid oidIndex = InvalidOid;
Oid pkeyIndex = InvalidOid;
Oid candidateIndex = InvalidOid;
MemoryContext oldcxt;
/* Quick exit if we already computed the list. */
@ -3519,17 +3530,45 @@ RelationGetIndexList(Relation relation)
Assert(!isnull);
indclass = (oidvector *) DatumGetPointer(indclassDatum);
/* Check to see if it is a unique, non-partial btree index on OID */
if (IndexIsValid(index) &&
index->indnatts == 1 &&
index->indisunique && index->indimmediate &&
/*
* Invalid, non-unique, non-immediate or predicate indexes aren't
* interesting for neither oid indexes nor replication identity
* indexes, so don't check them.
*/
if (!IndexIsValid(index) || !index->indisunique ||
!index->indimmediate ||
!heap_attisnull(htup, Anum_pg_index_indpred))
continue;
/* Check to see if is a usable btree index on OID */
if (index->indnatts == 1 &&
index->indkey.values[0] == ObjectIdAttributeNumber &&
indclass->values[0] == OID_BTREE_OPS_OID &&
heap_attisnull(htup, Anum_pg_index_indpred))
indclass->values[0] == OID_BTREE_OPS_OID)
oidIndex = index->indexrelid;
/* always prefer primary keys */
if (index->indisprimary)
pkeyIndex = index->indexrelid;
/* explicitly chosen index */
if (index->indisreplident)
candidateIndex = index->indexrelid;
}
systable_endscan(indscan);
/* primary key */
if (replident == REPLICA_IDENTITY_DEFAULT &&
OidIsValid(pkeyIndex))
relation->rd_replidindex = pkeyIndex;
/* explicitly chosen index */
else if (replident == REPLICA_IDENTITY_INDEX &&
OidIsValid(candidateIndex))
relation->rd_replidindex = candidateIndex;
/* nothing */
else
relation->rd_replidindex = InvalidOid;
heap_close(indrel, AccessShareLock);
/* Now save a copy of the completed list in the relcache entry. */