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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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6
src/backend/nodes/equalfuncs.c
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@@ -22,7 +22,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/equalfuncs.c,v 1.358 2009/07/26 23:34:18 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/equalfuncs.c,v 1.359 2009/07/29 20:56:19 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -1160,6 +1160,8 @@ _equalIndexStmt(IndexStmt *a, IndexStmt *b)
COMPARE_SCALAR_FIELD(unique);
COMPARE_SCALAR_FIELD(primary);
COMPARE_SCALAR_FIELD(isconstraint);
COMPARE_SCALAR_FIELD(deferrable);
COMPARE_SCALAR_FIELD(initdeferred);
COMPARE_SCALAR_FIELD(concurrent);
return true;
@@ -2068,6 +2070,8 @@ _equalConstraint(Constraint *a, Constraint *b)
COMPARE_NODE_FIELD(keys);
COMPARE_NODE_FIELD(options);
COMPARE_STRING_FIELD(indexspace);
COMPARE_SCALAR_FIELD(deferrable);
COMPARE_SCALAR_FIELD(initdeferred);
return true;
}