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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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10
src/backend/commands/copy.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/copy.c,v 1.315 2009/07/25 17:04:19 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/copy.c,v 1.316 2009/07/29 20:56:18 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -2130,6 +2130,8 @@ CopyFrom(CopyState cstate)
if (!skip_tuple)
{
List *recheckIndexes = NIL;
/* Place tuple in tuple slot */
ExecStoreTuple(tuple, slot, InvalidBuffer, false);
@ -2141,10 +2143,12 @@ CopyFrom(CopyState cstate)
heap_insert(cstate->rel, tuple, mycid, hi_options, bistate);
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);
/*
* We count only tuples not suppressed by a BEFORE INSERT trigger;