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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2009-07-29 20:56:21 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2009-07-29 20:56:21 +0000 |
| commit | 25d9bf2e3e66ee2e546c5c523d148ecab6ee1dcc (patch) | |
| tree | b0dee0f1d6111fd6658d432ec30e5ddb88adc02f /src/backend/executor/execMain.c | |
| parent | 850490579318ff52097eec92ce535357dd0c7a3a (diff) | |
| download | postgresql-25d9bf2e3e66ee2e546c5c523d148ecab6ee1dcc.tar.gz postgresql-25d9bf2e3e66ee2e546c5c523d148ecab6ee1dcc.zip | |
Support deferrable uniqueness constraints.
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
Diffstat (limited to 'src/backend/executor/execMain.c')
| -rw-r--r-- | src/backend/executor/execMain.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/src/backend/executor/execMain.c b/src/backend/executor/execMain.c index 1fddf10bc9a..1bfe48eaac4 100644 --- a/src/backend/executor/execMain.c +++ b/src/backend/executor/execMain.c @@ -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) |