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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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8
src/backend/nodes/outfuncs.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.361 2009/07/16 06:33:42 petere Exp $
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.362 2009/07/29 20:56:19 tgl Exp $
*
* NOTES
* Every node type that can appear in stored rules' parsetrees *must*
@ -1734,6 +1734,8 @@ _outIndexStmt(StringInfo str, IndexStmt *node)
WRITE_BOOL_FIELD(unique);
WRITE_BOOL_FIELD(primary);
WRITE_BOOL_FIELD(isconstraint);
WRITE_BOOL_FIELD(deferrable);
WRITE_BOOL_FIELD(initdeferred);
WRITE_BOOL_FIELD(concurrent);
}
@ -2285,6 +2287,8 @@ _outConstraint(StringInfo str, Constraint *node)
WRITE_NODE_FIELD(keys);
WRITE_NODE_FIELD(options);
WRITE_STRING_FIELD(indexspace);
WRITE_BOOL_FIELD(deferrable);
WRITE_BOOL_FIELD(initdeferred);
break;
case CONSTR_UNIQUE:
@ -2292,6 +2296,8 @@ _outConstraint(StringInfo str, Constraint *node)
WRITE_NODE_FIELD(keys);
WRITE_NODE_FIELD(options);
WRITE_STRING_FIELD(indexspace);
WRITE_BOOL_FIELD(deferrable);
WRITE_BOOL_FIELD(initdeferred);
break;
case CONSTR_CHECK: