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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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15
src/backend/executor/execMain.c
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@ -26,7 +26,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.326 2009/06/11 20:46:11 tgl Exp $
* $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.327 2009/07/29 20:56:18 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1753,6 +1753,7 @@ ExecInsert(TupleTableSlot *slot,
ResultRelInfo *resultRelInfo;
Relation resultRelationDesc;
Oid newId;
List *recheckIndexes = NIL;
/*
* get the heap tuple out of the tuple table slot, making sure we have a
@ -1834,10 +1835,11 @@ ExecInsert(TupleTableSlot *slot,
* insert index entries for tuple
*/
if (resultRelInfo->ri_NumIndices > 0)
ExecInsertIndexTuples(slot, &(tuple->t_self), estate, false);
recheckIndexes = ExecInsertIndexTuples(slot, &(tuple->t_self),
estate, false);
/* AFTER ROW INSERT Triggers */
ExecARInsertTriggers(estate, resultRelInfo, tuple);
ExecARInsertTriggers(estate, resultRelInfo, tuple, recheckIndexes);
/* Process RETURNING if present */
if (resultRelInfo->ri_projectReturning)
@ -1999,6 +2001,7 @@ ExecUpdate(TupleTableSlot *slot,
HTSU_Result result;
ItemPointerData update_ctid;
TransactionId update_xmax;
List *recheckIndexes = NIL;
/*
* abort the operation if not running transactions
@ -2132,10 +2135,12 @@ lreplace:;
* If it's a HOT update, we mustn't insert new index entries.
*/
if (resultRelInfo->ri_NumIndices > 0 && !HeapTupleIsHeapOnly(tuple))
ExecInsertIndexTuples(slot, &(tuple->t_self), estate, false);
recheckIndexes = ExecInsertIndexTuples(slot, &(tuple->t_self),
estate, false);
/* AFTER ROW UPDATE Triggers */
ExecARUpdateTriggers(estate, resultRelInfo, tupleid, tuple);
ExecARUpdateTriggers(estate, resultRelInfo, tupleid, tuple,
recheckIndexes);
/* Process RETURNING if present */
if (resultRelInfo->ri_projectReturning)