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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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6
src/backend/access/gist/gist.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/gist/gist.c,v 1.156 2009/01/01 17:23:34 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/gist/gist.c,v 1.157 2009/07/29 20:56:18 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -225,7 +225,7 @@ gistinsert(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
IndexTuple itup;
GISTSTATE giststate;
@ -248,7 +248,7 @@ gistinsert(PG_FUNCTION_ARGS)
MemoryContextSwitchTo(oldCtx);
MemoryContextDelete(insertCtx);
PG_RETURN_BOOL(true);
PG_RETURN_BOOL(false);
}