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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/include/access/nbtree.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/nbtree.h,v 1.124 2009/06/11 14:49:08 momjian Exp $
* $PostgreSQL: pgsql/src/include/access/nbtree.h,v 1.125 2009/07/29 20:56:19 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -517,8 +517,8 @@ extern Datum btoptions(PG_FUNCTION_ARGS);
/*
* prototypes for functions in nbtinsert.c
*/
extern void _bt_doinsert(Relation rel, IndexTuple itup,
bool index_is_unique, Relation heapRel);
extern bool _bt_doinsert(Relation rel, IndexTuple itup,
IndexUniqueCheck checkUnique, Relation heapRel);
extern Buffer _bt_getstackbuf(Relation rel, BTStack stack, int access);
extern void _bt_insert_parent(Relation rel, Buffer buf, Buffer rbuf,
BTStack stack, bool is_root, bool is_only);