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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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15
src/include/nodes/parsenodes.h
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@@ -13,7 +13,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.398 2009/07/26 23:34:18 tgl Exp $
* $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.399 2009/07/29 20:56:21 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -1355,7 +1355,7 @@ typedef struct CreateStmt
* Constraint attributes (DEFERRABLE etc) are initially represented as
* separate Constraint nodes for simplicity of parsing. parse_utilcmd.c makes
* a pass through the constraints list to attach the info to the appropriate
* FkConstraint node (and, perhaps, someday to other kinds of constraints).
* Constraint and FkConstraint nodes.
* ----------
*/
@@ -1385,6 +1385,8 @@ typedef struct Constraint
List *options; /* options from WITH clause */
char *indexspace; /* index tablespace for PKEY/UNIQUE
* constraints; NULL for default */
bool deferrable; /* DEFERRABLE */
bool initdeferred; /* INITIALLY DEFERRED */
} Constraint;
/* ----------
@@ -1555,12 +1557,11 @@ typedef struct CreateTrigStmt
/* events uses the TRIGGER_TYPE bits defined in catalog/pg_trigger.h */
int16 events; /* INSERT/UPDATE/DELETE/TRUNCATE */
/* The following are used for referential */
/* integrity constraint triggers */
bool isconstraint; /* This is an RI trigger */
/* The following are used for constraint triggers (RI and unique checks) */
bool isconstraint; /* This is a constraint trigger */
bool deferrable; /* [NOT] DEFERRABLE */
bool initdeferred; /* INITIALLY {DEFERRED|IMMEDIATE} */
RangeVar *constrrel; /* opposite relation */
RangeVar *constrrel; /* opposite relation, if RI trigger */
} CreateTrigStmt;
/* ----------------------
@@ -1864,6 +1865,8 @@ typedef struct IndexStmt
bool unique; /* is index unique? */
bool primary; /* is index on primary key? */
bool isconstraint; /* is it from a CONSTRAINT clause? */
bool deferrable; /* is the constraint DEFERRABLE? */
bool initdeferred; /* is the constraint INITIALLY DEFERRED? */
bool concurrent; /* should this be a concurrent index build? */
} IndexStmt;