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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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14
src/backend/nodes/outfuncs.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.373 2009/11/28 00:46:18 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.374 2009/12/07 05:22:22 tgl Exp $
*
* NOTES
* Every node type that can appear in stored rules' parsetrees *must*
@ -1798,6 +1798,7 @@ _outIndexStmt(StringInfo str, IndexStmt *node)
WRITE_NODE_FIELD(indexParams);
WRITE_NODE_FIELD(options);
WRITE_NODE_FIELD(whereClause);
WRITE_NODE_FIELD(excludeOpNames);
WRITE_BOOL_FIELD(unique);
WRITE_BOOL_FIELD(primary);
WRITE_BOOL_FIELD(isconstraint);
@ -2378,6 +2379,7 @@ _outConstraint(StringInfo str, Constraint *node)
WRITE_NODE_FIELD(keys);
WRITE_NODE_FIELD(options);
WRITE_STRING_FIELD(indexspace);
/* access_method and where_clause not currently used */
break;
case CONSTR_UNIQUE:
@ -2385,6 +2387,16 @@ _outConstraint(StringInfo str, Constraint *node)
WRITE_NODE_FIELD(keys);
WRITE_NODE_FIELD(options);
WRITE_STRING_FIELD(indexspace);
/* access_method and where_clause not currently used */
break;
case CONSTR_EXCLUSION:
appendStringInfo(str, "EXCLUSION");
WRITE_NODE_FIELD(exclusions);
WRITE_NODE_FIELD(options);
WRITE_STRING_FIELD(indexspace);
WRITE_STRING_FIELD(access_method);
WRITE_NODE_FIELD(where_clause);
break;
case CONSTR_FOREIGN: