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Add exclusion constraints, which generalize the concept of uniqueness to

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support any indexable commutative operator, not just equality.  Two rows
violate the exclusion constraint if "row1.col OP row2.col" is TRUE for
each of the columns in the constraint.

Jeff Davis, reviewed by Robert Haas
This commit is contained in:
Tom Lane
2009-12-07 05:22:23 +00:00
parent 8de7472b45
commit 0cb65564e5
43 changed files with 1613 additions and 236 deletions
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8
src/include/nodes/execnodes.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/nodes/execnodes.h,v 1.212 2009/11/20 20:38:11 tgl Exp $
* $PostgreSQL: pgsql/src/include/nodes/execnodes.h,v 1.213 2009/12/07 05:22:23 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -40,6 +40,9 @@
* ExpressionsState exec state for expressions, or NIL if none
* Predicate partial-index predicate, or NIL if none
* PredicateState exec state for predicate, or NIL if none
* ExclusionOps Per-column exclusion operators, or NULL if none
* ExclusionProcs Underlying function OIDs for ExclusionOps
* ExclusionStrats Opclass strategy numbers for ExclusionOps
* Unique is it a unique index?
* ReadyForInserts is it valid for inserts?
* Concurrent are we doing a concurrent index build?
@@ -58,6 +61,9 @@ typedef struct IndexInfo
List *ii_ExpressionsState; /* list of ExprState */
List *ii_Predicate; /* list of Expr */
List *ii_PredicateState; /* list of ExprState */
Oid *ii_ExclusionOps; /* array with one entry per column */
Oid *ii_ExclusionProcs; /* array with one entry per column */
uint16 *ii_ExclusionStrats; /* array with one entry per column */
bool ii_Unique;
bool ii_ReadyForInserts;
bool ii_Concurrent;