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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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5
src/include/utils/builtins.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/utils/builtins.h,v 1.334 2009/07/16 06:33:46 petere Exp $
* $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.335 2009/07/29 20:56:21 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1029,6 +1029,9 @@ extern Datum window_nth_value(PG_FUNCTION_ARGS);
/* access/transam/twophase.c */
extern Datum pg_prepared_xact(PG_FUNCTION_ARGS);
/* commands/constraint.c */
extern Datum unique_key_recheck(PG_FUNCTION_ARGS);
/* commands/prepare.c */
extern Datum pg_prepared_statement(PG_FUNCTION_ARGS);