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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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11
src/backend/access/gin/gininsert.c
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@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/gin/gininsert.c,v 1.22 2009/06/11 14:48:53 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/gin/gininsert.c,v 1.23 2009/07/29 20:56:17 tgl Exp $
*-------------------------------------------------------------------------
*/
@ -415,12 +415,11 @@ gininsert(PG_FUNCTION_ARGS)
#ifdef NOT_USED
Relation heapRel = (Relation) PG_GETARG_POINTER(4);
bool checkUnique = PG_GETARG_BOOL(5);
IndexUniqueCheck checkUnique = (IndexUniqueCheck) PG_GETARG_INT32(5);
#endif
GinState ginstate;
MemoryContext oldCtx;
MemoryContext insertCtx;
uint32 res = 0;
int i;
insertCtx = AllocSetContextCreate(CurrentMemoryContext,
@ -440,7 +439,7 @@ gininsert(PG_FUNCTION_ARGS)
memset(&collector, 0, sizeof(GinTupleCollector));
for (i = 0; i < ginstate.origTupdesc->natts; i++)
if (!isnull[i])
res += ginHeapTupleFastCollect(index, &ginstate, &collector,
ginHeapTupleFastCollect(index, &ginstate, &collector,
(OffsetNumber) (i + 1), values[i], ht_ctid);
ginHeapTupleFastInsert(index, &ginstate, &collector);
@ -449,7 +448,7 @@ gininsert(PG_FUNCTION_ARGS)
{
for (i = 0; i < ginstate.origTupdesc->natts; i++)
if (!isnull[i])
res += ginHeapTupleInsert(index, &ginstate,
ginHeapTupleInsert(index, &ginstate,
(OffsetNumber) (i + 1), values[i], ht_ctid);
}
@ -457,5 +456,5 @@ gininsert(PG_FUNCTION_ARGS)
MemoryContextSwitchTo(oldCtx);
MemoryContextDelete(insertCtx);
PG_RETURN_BOOL(res > 0);
PG_RETURN_BOOL(false);
}