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Support deferrable uniqueness constraints.

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The current implementation fires an AFTER ROW trigger for each tuple that
looks like it might be non-unique according to the index contents at the
time of insertion.  This works well as long as there aren't many conflicts,
but won't scale to massive unique-key reassignments.  Improving that case
is a TODO item.

Dean Rasheed
This commit is contained in:
Tom Lane
2009-07-29 20:56:21 +00:00
parent 8504905793
commit 25d9bf2e3e
51 changed files with 1241 additions and 245 deletions
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9
src/backend/access/nbtree/nbtree.c
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@ -12,7 +12,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtree.c,v 1.171 2009/06/11 14:48:54 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtree.c,v 1.172 2009/07/29 20:56:18 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -217,18 +217,19 @@ btinsert(PG_FUNCTION_ARGS)
bool *isnull = (bool *) PG_GETARG_POINTER(2);
ItemPointer ht_ctid = (ItemPointer) PG_GETARG_POINTER(3);
Relation heapRel = (Relation) PG_GETARG_POINTER(4);
bool checkUnique = PG_GETARG_BOOL(5);
IndexUniqueCheck checkUnique = (IndexUniqueCheck) PG_GETARG_INT32(5);
bool result;
IndexTuple itup;
/* generate an index tuple */
itup = index_form_tuple(RelationGetDescr(rel), values, isnull);
itup->t_tid = *ht_ctid;
_bt_doinsert(rel, itup, checkUnique, heapRel);
result = _bt_doinsert(rel, itup, checkUnique, heapRel);
pfree(itup);
PG_RETURN_BOOL(true);
PG_RETURN_BOOL(result);
}
/*