v22-0002-Add-temporal-PRIMARY-KEY-and-UNIQUE-constraints.patch

From bc5a3f671292d29acd3c05ea883ce1df04022eec Mon Sep 17 00:00:00 2001
From: "Paul A. Jungwirth" <pj@illuminatedcomputing.com>
Date: Mon, 28 Jun 2021 17:33:27 -0700
Subject: [PATCH v22 2/8] Add temporal PRIMARY KEY and UNIQUE constraints

- Added WITHOUT OVERLAPS to the bison grammar. We permit only range
  columns, not yet PERIODs (which we'll add soon).
- Temporal PRIMARY KEYs and UNIQUE constraints are backed by GiST
  indexes instead of B-tree indexes, since they are essentially
  exclusion constraints with = for the scalar parts of the key and &&
  for the temporal part.
- Added pg_constraint.contemporal to say whether a constraint is a
  temporal constraint.
- Added docs and tests.
- Added pg_dump support.
---
 contrib/btree_gist/Makefile                   |   3 +-
 .../btree_gist/expected/without_overlaps.out  |  31 ++
 contrib/btree_gist/sql/without_overlaps.sql   |  13 +
 doc/src/sgml/catalogs.sgml                    |  10 +
 doc/src/sgml/gist.sgml                        |  18 +-
 doc/src/sgml/ref/create_table.sgml            |  39 +-
 src/backend/access/gist/gistutil.c            |  29 ++
 src/backend/catalog/heap.c                    |   2 +
 src/backend/catalog/index.c                   |   4 +
 src/backend/catalog/pg_constraint.c           |   2 +
 src/backend/commands/indexcmds.c              | 157 ++++++-
 src/backend/commands/tablecmds.c              |   6 +-
 src/backend/commands/trigger.c                |   1 +
 src/backend/commands/typecmds.c               |   1 +
 src/backend/nodes/outfuncs.c                  |   2 +
 src/backend/nodes/readfuncs.c                 |   2 +
 src/backend/parser/gram.y                     |  29 +-
 src/backend/parser/parse_utilcmd.c            |  28 +-
 src/backend/utils/adt/ruleutils.c             |  14 +-
 src/backend/utils/cache/relcache.c            |  18 +-
 src/bin/pg_dump/pg_dump.c                     |  16 +-
 src/bin/pg_dump/pg_dump.h                     |   1 +
 src/bin/pg_dump/t/002_pg_dump.pl              |  40 ++
 src/bin/psql/describe.c                       |  12 +-
 src/include/access/gist_private.h             |   1 +
 src/include/access/stratnum.h                 |   1 +
 src/include/catalog/index.h                   |   1 +
 src/include/catalog/pg_constraint.h           |  10 +-
 src/include/commands/defrem.h                 |   7 +-
 src/include/nodes/parsenodes.h                |   2 +
 .../regress/expected/without_overlaps.out     | 395 ++++++++++++++++++
 src/test/regress/parallel_schedule            |   2 +-
 src/test/regress/sql/without_overlaps.sql     | 290 +++++++++++++
 33 files changed, 1131 insertions(+), 56 deletions(-)
 create mode 100644 contrib/btree_gist/expected/without_overlaps.out
 create mode 100644 contrib/btree_gist/sql/without_overlaps.sql
 create mode 100644 src/test/regress/expected/without_overlaps.out
 create mode 100644 src/test/regress/sql/without_overlaps.sql

diff --git a/contrib/btree_gist/Makefile b/contrib/btree_gist/Makefile
index fa1b987b39b..62aefadd81e 100644
--- a/contrib/btree_gist/Makefile
+++ b/contrib/btree_gist/Makefile
@@ -39,7 +39,8 @@ PGFILEDESC = "btree_gist - B-tree equivalent GiST operator classes"
 
 REGRESS = init int2 int4 int8 float4 float8 cash oid timestamp timestamptz \
         time timetz date interval macaddr macaddr8 inet cidr text varchar char \
-        bytea bit varbit numeric uuid not_equal enum bool partitions
+        bytea bit varbit numeric uuid not_equal enum bool partitions \
+        without_overlaps
 
 SHLIB_LINK += $(filter -lm, $(LIBS))
 
diff --git a/contrib/btree_gist/expected/without_overlaps.out b/contrib/btree_gist/expected/without_overlaps.out
new file mode 100644
index 00000000000..069272688fb
--- /dev/null
+++ b/contrib/btree_gist/expected/without_overlaps.out
@@ -0,0 +1,31 @@
+-- Core must test WITHOUT OVERLAPS
+-- with an int4range + tsrange,
+-- so here we do some simple tests
+-- to make sure int + tsrange works too,
+-- since that is the expected use-case.
+CREATE TABLE temporal_rng (
+  id integer,
+  valid_at tsrange,
+  CONSTRAINT temporal_rng_pk PRIMARY KEY (id, valid_at WITHOUT OVERLAPS)
+);
+\d temporal_rng
+             Table "public.temporal_rng"
+  Column  |  Type   | Collation | Nullable | Default 
+----------+---------+-----------+----------+---------
+ id       | integer |           | not null | 
+ valid_at | tsrange |           | not null | 
+Indexes:
+    "temporal_rng_pk" PRIMARY KEY (id, valid_at WITHOUT OVERLAPS)
+
+SELECT pg_get_constraintdef(oid) FROM pg_constraint WHERE conname = 'temporal_rng_pk';
+            pg_get_constraintdef             
+---------------------------------------------
+ PRIMARY KEY (id, valid_at WITHOUT OVERLAPS)
+(1 row)
+
+SELECT pg_get_indexdef(conindid, 0, true) FROM pg_constraint WHERE conname = 'temporal_rng_pk';
+                                pg_get_indexdef                                
+-------------------------------------------------------------------------------
+ CREATE UNIQUE INDEX temporal_rng_pk ON temporal_rng USING gist (id, valid_at)
+(1 row)
+
diff --git a/contrib/btree_gist/sql/without_overlaps.sql b/contrib/btree_gist/sql/without_overlaps.sql
new file mode 100644
index 00000000000..98665dbb9ec
--- /dev/null
+++ b/contrib/btree_gist/sql/without_overlaps.sql
@@ -0,0 +1,13 @@
+-- Core must test WITHOUT OVERLAPS
+-- with an int4range + tsrange,
+-- so here we do some simple tests
+-- to make sure int + tsrange works too,
+-- since that is the expected use-case.
+CREATE TABLE temporal_rng (
+  id integer,
+  valid_at tsrange,
+  CONSTRAINT temporal_rng_pk PRIMARY KEY (id, valid_at WITHOUT OVERLAPS)
+);
+\d temporal_rng
+SELECT pg_get_constraintdef(oid) FROM pg_constraint WHERE conname = 'temporal_rng_pk';
+SELECT pg_get_indexdef(conindid, 0, true) FROM pg_constraint WHERE conname = 'temporal_rng_pk';
diff --git a/doc/src/sgml/catalogs.sgml b/doc/src/sgml/catalogs.sgml
index 3ec7391ec5e..618a05ac896 100644
--- a/doc/src/sgml/catalogs.sgml
+++ b/doc/src/sgml/catalogs.sgml
@@ -2709,6 +2709,16 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
       </para></entry>
      </row>
 
+     <row>
+      <entry role="catalog_table_entry"><para role="column_definition">
+       <structfield>conwithoutoverlaps</structfield> <type>bool</type>
+      </para>
+      <para>
+       This constraint is defined with <literal>WITHOUT OVERLAPS</literal>
+       (for primary keys and unique constraints).
+      </para></entry>
+     </row>
+
      <row>
       <entry role="catalog_table_entry"><para role="column_definition">
        <structfield>conkey</structfield> <type>int2[]</type>
diff --git a/doc/src/sgml/gist.sgml b/doc/src/sgml/gist.sgml
index baa26c65cc3..f05875d36c1 100644
--- a/doc/src/sgml/gist.sgml
+++ b/doc/src/sgml/gist.sgml
@@ -298,7 +298,8 @@ CREATE INDEX ON my_table USING GIST (my_inet_column inet_ops);
    The optional twelfth method <function>stratnum</function> is used to translate
    well-known <literal>RT*StrategyNumbers</literal> (from
    <filename>src/include/access/stratnum.h</filename>) into strategy numbers
-   used by the opclass.
+   used by the opclass. This lets the core code look up operators for temporal
+   constraint indexes.
  </para>
 
  <variablelist>
@@ -1184,6 +1185,21 @@ my_sortsupport(PG_FUNCTION_ARGS)
        if the opclass has no matching strategy,
        or at least a strategy number that isn't used by this opclass.
       </para>
+      <para>
+       This is used for temporal index constraints
+       (i.e. <literal>PRIMARY KEY</literal> and <literal>UNIQUE</literal>).
+      </para>
+      <para>
+       If the opclass provides this function and it returns results
+       for <literal>RTEqualStrategyNumber</literal>, it can be used
+       in the non-<literal>WITHOUT OVERLAPS</literal> part(s) of an
+       index constraint.
+      </para>
+      <para>
+       If it returns results for <literal>RTOverlapStrategyNumber</literal>,
+       the opclass can be used in the <literal>WITHOUT OVERLAPS</literal>
+       part of an index constraint.
+      </para>
 
       <para>
        The <acronym>SQL</acronym> declaration of the function must look like
diff --git a/doc/src/sgml/ref/create_table.sgml b/doc/src/sgml/ref/create_table.sgml
index e04a0692c4e..a0bd2b8adc6 100644
--- a/doc/src/sgml/ref/create_table.sgml
+++ b/doc/src/sgml/ref/create_table.sgml
@@ -78,8 +78,8 @@ CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } | UNLOGGED ] TABLE [ IF NOT EXI
 [ CONSTRAINT <replaceable class="parameter">constraint_name</replaceable> ]
 { CHECK ( <replaceable class="parameter">expression</replaceable> ) [ NO INHERIT ] |
   NOT NULL <replaceable class="parameter">column_name</replaceable> [ NO INHERIT ] |
-  UNIQUE [ NULLS [ NOT ] DISTINCT ] ( <replaceable class="parameter">column_name</replaceable> [, ... ] ) <replaceable class="parameter">index_parameters</replaceable> |
-  PRIMARY KEY ( <replaceable class="parameter">column_name</replaceable> [, ... ] ) <replaceable class="parameter">index_parameters</replaceable> |
+  UNIQUE [ NULLS [ NOT ] DISTINCT ] ( <replaceable class="parameter">column_name</replaceable> [, ... ] [, <replaceable class="parameter">column_name</replaceable> WITHOUT OVERLAPS ] ) <replaceable class="parameter">index_parameters</replaceable> |
+  PRIMARY KEY ( <replaceable class="parameter">column_name</replaceable> [, ... ] [, <replaceable class="parameter">column_name</replaceable> WITHOUT OVERLAPS ] ) <replaceable class="parameter">index_parameters</replaceable> |
   EXCLUDE [ USING <replaceable class="parameter">index_method</replaceable> ] ( <replaceable class="parameter">exclude_element</replaceable> WITH <replaceable class="parameter">operator</replaceable> [, ... ] ) <replaceable class="parameter">index_parameters</replaceable> [ WHERE ( <replaceable class="parameter">predicate</replaceable> ) ] |
   FOREIGN KEY ( <replaceable class="parameter">column_name</replaceable> [, ... ] ) REFERENCES <replaceable class="parameter">reftable</replaceable> [ ( <replaceable class="parameter">refcolumn</replaceable> [, ... ] ) ]
     [ MATCH FULL | MATCH PARTIAL | MATCH SIMPLE ] [ ON DELETE <replaceable
@@ -965,7 +965,7 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
 
    <varlistentry id="sql-createtable-parms-unique">
     <term><literal>UNIQUE [ NULLS [ NOT ] DISTINCT ]</literal> (column constraint)</term>
-    <term><literal>UNIQUE [ NULLS [ NOT ] DISTINCT ] ( <replaceable class="parameter">column_name</replaceable> [, ... ] )</literal>
+    <term><literal>UNIQUE [ NULLS [ NOT ] DISTINCT ] ( <replaceable class="parameter">column_name</replaceable> [, ... ] [, <replaceable class="parameter">column_name</replaceable> WITHOUT OVERLAPS ] )</literal>
     <optional> <literal>INCLUDE ( <replaceable class="parameter">column_name</replaceable> [, ...])</literal> </optional> (table constraint)</term>
 
     <listitem>
@@ -979,6 +979,26 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
       of these columns.
      </para>
 
+     <para>
+      If the <literal>WITHOUT OVERLAPS</literal> option is specified for the
+      last column, then that column is checked for overlaps instead of
+      equality.  In that case, the other columns of the constraint will allow
+      duplicates so long as the duplicates don't overlap in the
+      <literal>WITHOUT OVERLAPS</literal> column.  (This is sometimes called a
+      temporal key, if the column is a range of dates or timestamps, but
+      PostgreSQL allows ranges over any base type.)  In effect, such a
+      constraint is enforced with an <literal>EXCLUDE</literal> constraint
+      rather than a <literal>UNIQUE</literal> constraint.  So for example
+      <literal>UNIQUE (id, valid_at WITHOUT OVERLAPS)</literal> behaves like
+      <literal>EXCLUDE USING GIST (id WITH =, valid_at WITH
+      &amp;&amp;)</literal>.  The <literal>WITHOUT OVERLAPS</literal> column
+      must have a range type.  The non-<literal>WITHOUT OVERLAPS</literal>
+      columns of the constraint can be any type that can be compared for
+      equality in a GiST index. By default only range types are supported, but
+      you can use other types by adding the <xref linkend="btree-gist"/>
+      extension (which is the expected way to use this feature).
+     </para>
+
      <para>
       For the purpose of a unique constraint, null values are not
       considered equal, unless <literal>NULLS NOT DISTINCT</literal> is
@@ -1001,7 +1021,9 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
 
      <para>
       Adding a unique constraint will automatically create a unique btree
-      index on the column or group of columns used in the constraint.
+      index on the column or group of columns used in the constraint. But if
+      the constraint includes a <literal>WITHOUT OVERLAPS</literal> clause,
+      it will use a GiST index.
      </para>
 
      <para>
@@ -1019,7 +1041,7 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
 
    <varlistentry id="sql-createtable-parms-primary-key">
     <term><literal>PRIMARY KEY</literal> (column constraint)</term>
-    <term><literal>PRIMARY KEY ( <replaceable class="parameter">column_name</replaceable> [, ... ] )</literal>
+    <term><literal>PRIMARY KEY ( <replaceable class="parameter">column_name</replaceable> [, ... ] [, <replaceable class="parameter">column_name</replaceable> WITHOUT OVERLAPS ] )</literal>
     <optional> <literal>INCLUDE ( <replaceable class="parameter">column_name</replaceable> [, ...])</literal> </optional> (table constraint)</term>
     <listitem>
      <para>
@@ -1052,9 +1074,10 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
      </para>
 
      <para>
-      Adding a <literal>PRIMARY KEY</literal> constraint will automatically
-      create a unique btree index on the column or group of columns used in the
-      constraint.
+      As with a <literal>UNIQUE</literal> constraint, adding a
+      <literal>PRIMARY KEY</literal> constraint will automatically create a
+      unique btree index, or GiST if <literal>WITHOUT OVERLAPS</literal> was
+      specified, on the column or group of columns used in the constraint.
      </para>
 
      <para>
diff --git a/src/backend/access/gist/gistutil.c b/src/backend/access/gist/gistutil.c
index 5bf13ec680e..1056ddd6428 100644
--- a/src/backend/access/gist/gistutil.c
+++ b/src/backend/access/gist/gistutil.c
@@ -1098,3 +1098,32 @@ gist_stratnum_btree(PG_FUNCTION_ARGS)
 			PG_RETURN_UINT16(InvalidStrategy);
 	}
 }
+
+/*
+ * Returns the opclass's private stratnum used for the given strategy.
+ *
+ * Calls the opclass's GIST_STRATNUM_PROC support function, if any,
+ * and returns the result.
+ * Returns InvalidStrategy if the function is not defined.
+ */
+StrategyNumber
+gistTranslateStratnum(Oid opclass, StrategyNumber strat)
+{
+	Oid	opfamily;
+	Oid	opcintype;
+	Oid	funcid;
+	Datum result;
+
+	/* Look up the opclass family and input datatype. */
+	if (!get_opclass_opfamily_and_input_type(opclass, &opfamily, &opcintype))
+		return InvalidStrategy;
+
+	/* Check whether the function is provided. */
+	funcid = get_opfamily_proc(opfamily, opcintype, opcintype, GIST_STRATNUM_PROC);
+	if (!OidIsValid(funcid))
+		return InvalidStrategy;
+
+	/* Ask the translation function */
+	result = OidFunctionCall1Coll(funcid, InvalidOid, UInt16GetDatum(strat));
+	return DatumGetUInt16(result);
+}
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index e80a90ef4c0..7abc2e0d22d 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -2143,6 +2143,7 @@ StoreRelCheck(Relation rel, const char *ccname, Node *expr,
 							  is_local, /* conislocal */
 							  inhcount, /* coninhcount */
 							  is_no_inherit,	/* connoinherit */
+							  false,	/* conwithoutoverlaps */
 							  is_internal); /* internally constructed? */
 
 	pfree(ccbin);
@@ -2193,6 +2194,7 @@ StoreRelNotNull(Relation rel, const char *nnname, AttrNumber attnum,
 							  is_local,
 							  inhcount,
 							  is_no_inherit,
+							  false,	/* conwithoutoverlaps */
 							  false);
 	return constrOid;
 }
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 88f7994b5a6..2934b553062 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -1895,6 +1895,7 @@ index_concurrently_set_dead(Oid heapId, Oid indexId)
  *		INDEX_CONSTR_CREATE_UPDATE_INDEX: update the pg_index row
  *		INDEX_CONSTR_CREATE_REMOVE_OLD_DEPS: remove existing dependencies
  *			of index on table's columns
+ *		INDEX_CONSTR_CREATE_WITHOUT_OVERLAPS: constraint uses WITHOUT OVERLAPS
  * allow_system_table_mods: allow table to be a system catalog
  * is_internal: index is constructed due to internal process
  */
@@ -1918,11 +1919,13 @@ index_constraint_create(Relation heapRelation,
 	bool		mark_as_primary;
 	bool		islocal;
 	bool		noinherit;
+	bool		is_without_overlaps;
 	int			inhcount;
 
 	deferrable = (constr_flags & INDEX_CONSTR_CREATE_DEFERRABLE) != 0;
 	initdeferred = (constr_flags & INDEX_CONSTR_CREATE_INIT_DEFERRED) != 0;
 	mark_as_primary = (constr_flags & INDEX_CONSTR_CREATE_MARK_AS_PRIMARY) != 0;
+	is_without_overlaps = (constr_flags & INDEX_CONSTR_CREATE_WITHOUT_OVERLAPS) != 0;
 
 	/* constraint creation support doesn't work while bootstrapping */
 	Assert(!IsBootstrapProcessingMode());
@@ -1999,6 +2002,7 @@ index_constraint_create(Relation heapRelation,
 								   islocal,
 								   inhcount,
 								   noinherit,
+								   is_without_overlaps,
 								   is_internal);
 
 	/*
diff --git a/src/backend/catalog/pg_constraint.c b/src/backend/catalog/pg_constraint.c
index a0232aa1bbf..0a95608179d 100644
--- a/src/backend/catalog/pg_constraint.c
+++ b/src/backend/catalog/pg_constraint.c
@@ -78,6 +78,7 @@ CreateConstraintEntry(const char *constraintName,
 					  bool conIsLocal,
 					  int conInhCount,
 					  bool conNoInherit,
+					  bool conWithoutOverlaps,
 					  bool is_internal)
 {
 	Relation	conDesc;
@@ -193,6 +194,7 @@ CreateConstraintEntry(const char *constraintName,
 	values[Anum_pg_constraint_conislocal - 1] = BoolGetDatum(conIsLocal);
 	values[Anum_pg_constraint_coninhcount - 1] = Int16GetDatum(conInhCount);
 	values[Anum_pg_constraint_connoinherit - 1] = BoolGetDatum(conNoInherit);
+	values[Anum_pg_constraint_conwithoutoverlaps - 1] = BoolGetDatum(conWithoutOverlaps);
 
 	if (conkeyArray)
 		values[Anum_pg_constraint_conkey - 1] = PointerGetDatum(conkeyArray);
diff --git a/src/backend/commands/indexcmds.c b/src/backend/commands/indexcmds.c
index 340248a3f29..30162ee7aae 100644
--- a/src/backend/commands/indexcmds.c
+++ b/src/backend/commands/indexcmds.c
@@ -16,6 +16,7 @@
 #include "postgres.h"
 
 #include "access/amapi.h"
+#include "access/gist_private.h"
 #include "access/heapam.h"
 #include "access/htup_details.h"
 #include "access/reloptions.h"
@@ -86,6 +87,7 @@ static void ComputeIndexAttrs(IndexInfo *indexInfo,
 							  Oid accessMethodId,
 							  bool amcanorder,
 							  bool isconstraint,
+							  bool iswithoutoverlaps,
 							  Oid ddl_userid,
 							  int ddl_sec_context,
 							  int *ddl_save_nestlevel);
@@ -144,6 +146,7 @@ typedef struct ReindexErrorInfo
  *		to index on.
  * 'exclusionOpNames': list of names of exclusion-constraint operators,
  *		or NIL if not an exclusion constraint.
+ * 'isWithoutOverlaps': true iff this index has a WITHOUT OVERLAPS clause.
  *
  * This is tailored to the needs of ALTER TABLE ALTER TYPE, which recreates
  * any indexes that depended on a changing column from their pg_get_indexdef
@@ -173,7 +176,8 @@ bool
 CheckIndexCompatible(Oid oldId,
 					 const char *accessMethodName,
 					 const List *attributeList,
-					 const List *exclusionOpNames)
+					 const List *exclusionOpNames,
+					 bool isWithoutOverlaps)
 {
 	bool		isconstraint;
 	Oid		   *typeIds;
@@ -248,8 +252,8 @@ CheckIndexCompatible(Oid oldId,
 					  coloptions, attributeList,
 					  exclusionOpNames, relationId,
 					  accessMethodName, accessMethodId,
-					  amcanorder, isconstraint, InvalidOid, 0, NULL);
-
+					  amcanorder, isconstraint, isWithoutOverlaps, InvalidOid,
+					  0, NULL);
 
 	/* Get the soon-obsolete pg_index tuple. */
 	tuple = SearchSysCache1(INDEXRELID, ObjectIdGetDatum(oldId));
@@ -559,6 +563,7 @@ DefineIndex(Oid tableId,
 	bool		amcanorder;
 	bool		amissummarizing;
 	amoptions_function amoptions;
+	bool		exclusion;
 	bool		partitioned;
 	bool		safe_index;
 	Datum		reloptions;
@@ -677,6 +682,12 @@ DefineIndex(Oid tableId,
 
 	namespaceId = RelationGetNamespace(rel);
 
+	/*
+	 * It has exclusion constraint behavior if it's an EXCLUDE constraint
+	 * or a temporal PRIMARY KEY/UNIQUE constraint
+	 */
+	exclusion = stmt->excludeOpNames || stmt->iswithoutoverlaps;
+
 	/* Ensure that it makes sense to index this kind of relation */
 	switch (rel->rd_rel->relkind)
 	{
@@ -845,7 +856,7 @@ DefineIndex(Oid tableId,
 	pgstat_progress_update_param(PROGRESS_CREATEIDX_ACCESS_METHOD_OID,
 								 accessMethodId);
 
-	if (stmt->unique && !amRoutine->amcanunique)
+	if (stmt->unique && !stmt->iswithoutoverlaps && !amRoutine->amcanunique)
 		ereport(ERROR,
 				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
 				 errmsg("access method \"%s\" does not support unique indexes",
@@ -860,7 +871,7 @@ DefineIndex(Oid tableId,
 				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
 				 errmsg("access method \"%s\" does not support multicolumn indexes",
 						accessMethodName)));
-	if (stmt->excludeOpNames && amRoutine->amgettuple == NULL)
+	if (exclusion && amRoutine->amgettuple == NULL)
 		ereport(ERROR,
 				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
 				 errmsg("access method \"%s\" does not support exclusion constraints",
@@ -913,8 +924,9 @@ DefineIndex(Oid tableId,
 					  coloptions, allIndexParams,
 					  stmt->excludeOpNames, tableId,
 					  accessMethodName, accessMethodId,
-					  amcanorder, stmt->isconstraint, root_save_userid,
-					  root_save_sec_context, &root_save_nestlevel);
+					  amcanorder, stmt->isconstraint, stmt->iswithoutoverlaps,
+					  root_save_userid, root_save_sec_context,
+					  &root_save_nestlevel);
 
 	/*
 	 * Extra checks when creating a PRIMARY KEY index.
@@ -932,7 +944,7 @@ DefineIndex(Oid tableId,
 	 * We could lift this limitation if we had global indexes, but those have
 	 * their own problems, so this is a useful feature combination.
 	 */
-	if (partitioned && (stmt->unique || stmt->excludeOpNames))
+	if (partitioned && (stmt->unique || exclusion))
 	{
 		PartitionKey key = RelationGetPartitionKey(rel);
 		const char *constraint_type;
@@ -986,10 +998,10 @@ DefineIndex(Oid tableId,
 			 * associated with index columns, too.  We know what to do with
 			 * btree opclasses; if there are ever any other index types that
 			 * support unique indexes, this logic will need extension. But if
-			 * we have an exclusion constraint, it already knows the
-			 * operators, so we don't have to infer them.
+			 * we have an exclusion constraint (or a temporal PK), it already
+			 * knows the operators, so we don't have to infer them.
 			 */
-			if (stmt->unique && accessMethodId != BTREE_AM_OID)
+			if (stmt->unique && !stmt->iswithoutoverlaps && accessMethodId != BTREE_AM_OID)
 				ereport(ERROR,
 						(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
 						 errmsg("cannot match partition key to an index using access method \"%s\"",
@@ -1028,12 +1040,12 @@ DefineIndex(Oid tableId,
 					{
 						Oid			idx_eqop = InvalidOid;
 
-						if (stmt->unique)
+						if (stmt->unique && !stmt->iswithoutoverlaps)
 							idx_eqop = get_opfamily_member(idx_opfamily,
 														   idx_opcintype,
 														   idx_opcintype,
 														   BTEqualStrategyNumber);
-						else if (stmt->excludeOpNames)
+						else if (exclusion)
 							idx_eqop = indexInfo->ii_ExclusionOps[j];
 						Assert(idx_eqop);
 
@@ -1042,7 +1054,7 @@ DefineIndex(Oid tableId,
 							found = true;
 							break;
 						}
-						else if (stmt->excludeOpNames)
+						else if (exclusion)
 						{
 							/*
 							 * We found a match, but it's not an equality
@@ -1186,6 +1198,8 @@ DefineIndex(Oid tableId,
 		constr_flags |= INDEX_CONSTR_CREATE_DEFERRABLE;
 	if (stmt->initdeferred)
 		constr_flags |= INDEX_CONSTR_CREATE_INIT_DEFERRED;
+	if (stmt->iswithoutoverlaps)
+		constr_flags |= INDEX_CONSTR_CREATE_WITHOUT_OVERLAPS;
 
 	indexRelationId =
 		index_create(rel, indexRelationName, indexRelationId, parentIndexId,
@@ -1850,6 +1864,7 @@ ComputeIndexAttrs(IndexInfo *indexInfo,
 				  Oid accessMethodId,
 				  bool amcanorder,
 				  bool isconstraint,
+				  bool iswithoutoverlaps,
 				  Oid ddl_userid,
 				  int ddl_sec_context,
 				  int *ddl_save_nestlevel)
@@ -1873,6 +1888,14 @@ ComputeIndexAttrs(IndexInfo *indexInfo,
 	else
 		nextExclOp = NULL;
 
+	/* exclusionOpNames can be non-NIL if we are creating a partition */
+	if (iswithoutoverlaps && exclusionOpNames == NIL)
+	{
+		indexInfo->ii_ExclusionOps = palloc_array(Oid, nkeycols);
+		indexInfo->ii_ExclusionProcs = palloc_array(Oid, nkeycols);
+		indexInfo->ii_ExclusionStrats = palloc_array(uint16, nkeycols);
+	}
+
 	if (OidIsValid(ddl_userid))
 		GetUserIdAndSecContext(&save_userid, &save_sec_context);
 
@@ -2149,6 +2172,31 @@ ComputeIndexAttrs(IndexInfo *indexInfo,
 			indexInfo->ii_ExclusionStrats[attn] = strat;
 			nextExclOp = lnext(exclusionOpNames, nextExclOp);
 		}
+		else if (iswithoutoverlaps)
+		{
+			StrategyNumber strat;
+			Oid opid;
+			char *opname;
+
+			if (attn == nkeycols - 1)
+			{
+				strat = RTOverlapStrategyNumber;
+				opname = "overlaps";
+			}
+			else
+			{
+				strat = RTEqualStrategyNumber;
+				opname = "equals";
+			}
+			GetOperatorFromCanonicalStrategy(opclassOids[attn],
+											 atttype,
+											 opname,
+											 &opid,
+											 &strat);
+			indexInfo->ii_ExclusionOps[attn] = opid;
+			indexInfo->ii_ExclusionProcs[attn] = get_opcode(opid);
+			indexInfo->ii_ExclusionStrats[attn] = strat;
+		}
 
 		/*
 		 * Set up the per-column options (indoption field).  For now, this is
@@ -2379,6 +2427,87 @@ GetDefaultOpClass(Oid type_id, Oid am_id)
 	return InvalidOid;
 }
 
+/*
+ * GetOperatorFromCanonicalStrategy
+ *
+ * opclass - the opclass to use
+ * atttype - the type to ask about
+ * opname - used to build error messages
+ * opid - holds the operator we found
+ * strat - holds the input and output strategy number
+ *
+ * Finds an operator from a "well-known" strategy number.
+ * This is used for temporal index constraints
+ * (and other temporal features)
+ * to look up equality and overlaps operators, since
+ * the strategy numbers for non-btree indexams need not
+ * follow any fixed scheme. We ask an opclass support
+ * function to translate from the well-known number
+ * to the internal value. If the function isn't defined
+ * or it gives no result, we retrun InvalidStrategy.
+ */
+void
+GetOperatorFromCanonicalStrategy(Oid opclass,
+								 Oid atttype,
+								 const char *opname,
+								 Oid *opid,
+								 StrategyNumber *strat)
+{
+	Oid opfamily;
+	Oid opcintype;
+	StrategyNumber opstrat = *strat;
+
+	*opid = InvalidOid;
+
+	if (get_opclass_opfamily_and_input_type(opclass,
+											&opfamily,
+											&opcintype))
+	{
+		/*
+		 * Ask the opclass to translate to its internal stratnum
+		 *
+		 * For now we only need GiST support, but this could support
+		 * other indexams if we wanted.
+		 */
+		*strat = gistTranslateStratnum(opclass, opstrat);
+		if (!StrategyIsValid(*strat))
+			ereport(ERROR,
+					(errcode(ERRCODE_UNDEFINED_OBJECT),
+					 errmsg("no %s operator found for WITHOUT OVERLAPS constraint", opname),
+					 errdetail("Could not translate strategy number %u for opclass %d.",
+						 opstrat, opclass),
+					 errhint("Define a stratnum support function for your GiST opclass.")));
+
+		*opid = get_opfamily_member(opfamily, opcintype, opcintype, *strat);
+	}
+
+	if (!OidIsValid(*opid))
+	{
+		HeapTuple	opftuple;
+		Form_pg_opfamily opfform;
+
+		/*
+		 * attribute->opclass might not explicitly name the opfamily,
+		 * so fetch the name of the selected opfamily for use in the
+		 * error message.
+		 */
+		opftuple = SearchSysCache1(OPFAMILYOID,
+								   ObjectIdGetDatum(opfamily));
+		if (!HeapTupleIsValid(opftuple))
+			elog(ERROR, "cache lookup failed for opfamily %u",
+				 opfamily);
+		opfform = (Form_pg_opfamily) GETSTRUCT(opftuple);
+
+		ereport(ERROR,
+				(errcode(ERRCODE_UNDEFINED_OBJECT),
+				 errmsg("no %s operator found for WITHOUT OVERLAPS constraint", opname),
+				 errdetail("There must be an %s operator within opfamily \"%s\" for type \"%s\".",
+						   opname,
+						   NameStr(opfform->opfname),
+						   format_type_be(atttype))));
+	}
+}
+
 /*
  *	makeObjectName()
  *
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 2822b2bb440..c696438ed5e 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -10225,6 +10225,7 @@ addFkRecurseReferenced(List **wqueue, Constraint *fkconstraint, Relation rel,
 									  conislocal,	/* islocal */
 									  coninhcount,	/* inhcount */
 									  connoinherit, /* conNoInherit */
+									  false,	/* conWithoutOverlaps */
 									  false);	/* is_internal */
 
 	ObjectAddressSet(address, ConstraintRelationId, constrOid);
@@ -10523,6 +10524,7 @@ addFkRecurseReferencing(List **wqueue, Constraint *fkconstraint, Relation rel,
 									  false,
 									  1,
 									  false,
+									  false,	/* conWithoutOverlaps */
 									  false);
 
 			/*
@@ -11028,6 +11030,7 @@ CloneFkReferencing(List **wqueue, Relation parentRel, Relation partRel)
 								  false,	/* islocal */
 								  1,	/* inhcount */
 								  false,	/* conNoInherit */
+								  false,	/* conWithoutOverlaps */
 								  true);
 
 		/* Set up partition dependencies for the new constraint */
@@ -14441,7 +14444,8 @@ TryReuseIndex(Oid oldId, IndexStmt *stmt)
 	if (CheckIndexCompatible(oldId,
 							 stmt->accessMethod,
 							 stmt->indexParams,
-							 stmt->excludeOpNames))
+							 stmt->excludeOpNames,
+							 stmt->iswithoutoverlaps))
 	{
 		Relation	irel = index_open(oldId, NoLock);
 
diff --git a/src/backend/commands/trigger.c b/src/backend/commands/trigger.c
index 6873c3b4d9d..34ea3d19c8c 100644
--- a/src/backend/commands/trigger.c
+++ b/src/backend/commands/trigger.c
@@ -841,6 +841,7 @@ CreateTriggerFiringOn(CreateTrigStmt *stmt, const char *queryString,
 											  true, /* islocal */
 											  0,	/* inhcount */
 											  true, /* noinherit */
+											  false, /* conwithoutoverlaps */
 											  isInternal);	/* is_internal */
 	}
 
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 27cc186c16f..a400fb39f67 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -3544,6 +3544,7 @@ domainAddConstraint(Oid domainOid, Oid domainNamespace, Oid baseTypeOid,
 							  true, /* is local */
 							  0,	/* inhcount */
 							  false,	/* connoinherit */
+							  false,	/* conwithoutoverlaps */
 							  false);	/* is_internal */
 	if (constrAddr)
 		ObjectAddressSet(*constrAddr, ConstraintRelationId, ccoid);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index 296ba845187..03f67b68506 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -756,6 +756,7 @@ _outConstraint(StringInfo str, const Constraint *node)
 		case CONSTR_PRIMARY:
 			appendStringInfoString(str, "PRIMARY_KEY");
 			WRITE_NODE_FIELD(keys);
+			WRITE_BOOL_FIELD(without_overlaps);
 			WRITE_NODE_FIELD(including);
 			WRITE_NODE_FIELD(options);
 			WRITE_STRING_FIELD(indexname);
@@ -768,6 +769,7 @@ _outConstraint(StringInfo str, const Constraint *node)
 			appendStringInfoString(str, "UNIQUE");
 			WRITE_BOOL_FIELD(nulls_not_distinct);
 			WRITE_NODE_FIELD(keys);
+			WRITE_BOOL_FIELD(without_overlaps);
 			WRITE_NODE_FIELD(including);
 			WRITE_NODE_FIELD(options);
 			WRITE_STRING_FIELD(indexname);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 1624b345812..cfb552fde74 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -427,6 +427,7 @@ _readConstraint(void)
 
 		case CONSTR_PRIMARY:
 			READ_NODE_FIELD(keys);
+			READ_BOOL_FIELD(without_overlaps);
 			READ_NODE_FIELD(including);
 			READ_NODE_FIELD(options);
 			READ_STRING_FIELD(indexname);
@@ -438,6 +439,7 @@ _readConstraint(void)
 		case CONSTR_UNIQUE:
 			READ_BOOL_FIELD(nulls_not_distinct);
 			READ_NODE_FIELD(keys);
+			READ_BOOL_FIELD(without_overlaps);
 			READ_NODE_FIELD(including);
 			READ_NODE_FIELD(options);
 			READ_STRING_FIELD(indexname);
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index 6b88096e8e1..0a57611c383 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -528,7 +528,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
 				columnref in_expr having_clause func_table xmltable array_expr
 				OptWhereClause operator_def_arg
 %type <list>	rowsfrom_item rowsfrom_list opt_col_def_list
-%type <boolean> opt_ordinality
+%type <boolean> opt_ordinality opt_without_overlaps
 %type <list>	ExclusionConstraintList ExclusionConstraintElem
 %type <list>	func_arg_list func_arg_list_opt
 %type <node>	func_arg_expr
@@ -4127,7 +4127,7 @@ ConstraintElem:
 					n->initially_valid = true;
 					$$ = (Node *) n;
 				}
-			| UNIQUE opt_unique_null_treatment '(' columnList ')' opt_c_include opt_definition OptConsTableSpace
+			| UNIQUE opt_unique_null_treatment '(' columnList opt_without_overlaps ')' opt_c_include opt_definition OptConsTableSpace
 				ConstraintAttributeSpec
 				{
 					Constraint *n = makeNode(Constraint);
@@ -4136,11 +4136,12 @@ ConstraintElem:
 					n->location = @1;
 					n->nulls_not_distinct = !$2;
 					n->keys = $4;
-					n->including = $6;
-					n->options = $7;
+					n->without_overlaps = $5;
+					n->including = $7;
+					n->options = $8;
 					n->indexname = NULL;
-					n->indexspace = $8;
-					processCASbits($9, @9, "UNIQUE",
+					n->indexspace = $9;
+					processCASbits($10, @10, "UNIQUE",
 								   &n->deferrable, &n->initdeferred, NULL,
 								   NULL, yyscanner);
 					$$ = (Node *) n;
@@ -4161,7 +4162,7 @@ ConstraintElem:
 								   NULL, yyscanner);
 					$$ = (Node *) n;
 				}
-			| PRIMARY KEY '(' columnList ')' opt_c_include opt_definition OptConsTableSpace
+			| PRIMARY KEY '(' columnList opt_without_overlaps ')' opt_c_include opt_definition OptConsTableSpace
 				ConstraintAttributeSpec
 				{
 					Constraint *n = makeNode(Constraint);
@@ -4169,11 +4170,12 @@ ConstraintElem:
 					n->contype = CONSTR_PRIMARY;
 					n->location = @1;
 					n->keys = $4;
-					n->including = $6;
-					n->options = $7;
+					n->without_overlaps = $5;
+					n->including = $7;
+					n->options = $8;
 					n->indexname = NULL;
-					n->indexspace = $8;
-					processCASbits($9, @9, "PRIMARY KEY",
+					n->indexspace = $9;
+					processCASbits($10, @10, "PRIMARY KEY",
 								   &n->deferrable, &n->initdeferred, NULL,
 								   NULL, yyscanner);
 					$$ = (Node *) n;
@@ -4241,6 +4243,11 @@ opt_no_inherit:	NO INHERIT							{  $$ = true; }
 			| /* EMPTY */							{  $$ = false; }
 		;
 
+opt_without_overlaps:
+			WITHOUT OVERLAPS						{ $$ = true; }
+			| /*EMPTY*/								{ $$ = false; }
+	;
+
 opt_column_list:
 			'(' columnList ')'						{ $$ = $2; }
 			| /*EMPTY*/								{ $$ = NIL; }
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index b2d1fa9d0d6..0772a0210e7 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -1716,6 +1716,7 @@ generateClonedIndexStmt(RangeVar *heapRel, Relation source_idx,
 	index->unique = idxrec->indisunique;
 	index->nulls_not_distinct = idxrec->indnullsnotdistinct;
 	index->primary = idxrec->indisprimary;
+	index->iswithoutoverlaps = (idxrec->indisprimary || idxrec->indisunique) && idxrec->indisexclusion;
 	index->transformed = true;	/* don't need transformIndexStmt */
 	index->concurrent = false;
 	index->if_not_exists = false;
@@ -1765,7 +1766,9 @@ generateClonedIndexStmt(RangeVar *heapRel, Relation source_idx,
 				int			nElems;
 				int			i;
 
-				Assert(conrec->contype == CONSTRAINT_EXCLUSION);
+				Assert(conrec->contype == CONSTRAINT_EXCLUSION ||
+						(index->iswithoutoverlaps &&
+						 (conrec->contype == CONSTRAINT_PRIMARY || conrec->contype == CONSTRAINT_UNIQUE)));
 				/* Extract operator OIDs from the pg_constraint tuple */
 				datum = SysCacheGetAttrNotNull(CONSTROID, ht_constr,
 											   Anum_pg_constraint_conexclop);
@@ -2305,6 +2308,7 @@ transformIndexConstraint(Constraint *constraint, CreateStmtContext *cxt)
 	}
 	index->nulls_not_distinct = constraint->nulls_not_distinct;
 	index->isconstraint = true;
+	index->iswithoutoverlaps = constraint->without_overlaps;
 	index->deferrable = constraint->deferrable;
 	index->initdeferred = constraint->initdeferred;
 
@@ -2397,6 +2401,11 @@ transformIndexConstraint(Constraint *constraint, CreateStmtContext *cxt)
 					 errmsg("index \"%s\" is not valid", index_name),
 					 parser_errposition(cxt->pstate, constraint->location)));
 
+		/*
+		 * Today we forbid non-unique indexes, but we could permit GiST
+		 * indexes whose last entry is a range type and use that to create a
+		 * WITHOUT OVERLAPS constraint (i.e. a temporal constraint).
+		 */
 		if (!index_form->indisunique)
 			ereport(ERROR,
 					(errcode(ERRCODE_WRONG_OBJECT_TYPE),
@@ -2673,6 +2682,23 @@ transformIndexConstraint(Constraint *constraint, CreateStmtContext *cxt)
 				notnullcmds = lappend(notnullcmds, notnullcmd);
 			}
 		}
+
+		if (constraint->without_overlaps)
+		{
+			/*
+			 * This enforces that there is at least one equality column besides
+			 * the WITHOUT OVERLAPS columns.  This is per SQL standard.  XXX
+			 * Do we need this?
+			 */
+			if (list_length(constraint->keys) < 2)
+				ereport(ERROR,
+						errcode(ERRCODE_SYNTAX_ERROR),
+						errmsg("constraint using WITHOUT OVERLAPS needs at least two columns"));
+
+			/* WITHOUT OVERLAPS requires a GiST index */
+			index->accessMethod = "gist";
+		}
+
 	}
 
 	/*
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 0b2a164057b..d140ab4bdda 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -339,7 +339,7 @@ static char *pg_get_viewdef_worker(Oid viewoid,
 								   int prettyFlags, int wrapColumn);
 static char *pg_get_triggerdef_worker(Oid trigid, bool pretty);
 static int	decompile_column_index_array(Datum column_index_array, Oid relId,
-										 StringInfo buf);
+										 bool withoutOverlaps, StringInfo buf);
 static char *pg_get_ruledef_worker(Oid ruleoid, int prettyFlags);
 static char *pg_get_indexdef_worker(Oid indexrelid, int colno,
 									const Oid *excludeOps,
@@ -2247,7 +2247,7 @@ pg_get_constraintdef_worker(Oid constraintId, bool fullCommand,
 				val = SysCacheGetAttrNotNull(CONSTROID, tup,
 											 Anum_pg_constraint_conkey);
 
-				decompile_column_index_array(val, conForm->conrelid, &buf);
+				decompile_column_index_array(val, conForm->conrelid, false, &buf);
 
 				/* add foreign relation name */
 				appendStringInfo(&buf, ") REFERENCES %s(",
@@ -2258,7 +2258,7 @@ pg_get_constraintdef_worker(Oid constraintId, bool fullCommand,
 				val = SysCacheGetAttrNotNull(CONSTROID, tup,
 											 Anum_pg_constraint_confkey);
 
-				decompile_column_index_array(val, conForm->confrelid, &buf);
+				decompile_column_index_array(val, conForm->confrelid, false, &buf);
 
 				appendStringInfoChar(&buf, ')');
 
@@ -2344,7 +2344,7 @@ pg_get_constraintdef_worker(Oid constraintId, bool fullCommand,
 				if (!isnull)
 				{
 					appendStringInfoString(&buf, " (");
-					decompile_column_index_array(val, conForm->conrelid, &buf);
+					decompile_column_index_array(val, conForm->conrelid, false, &buf);
 					appendStringInfoChar(&buf, ')');
 				}
 
@@ -2379,7 +2379,7 @@ pg_get_constraintdef_worker(Oid constraintId, bool fullCommand,
 				val = SysCacheGetAttrNotNull(CONSTROID, tup,
 											 Anum_pg_constraint_conkey);
 
-				keyatts = decompile_column_index_array(val, conForm->conrelid, &buf);
+				keyatts = decompile_column_index_array(val, conForm->conrelid, conForm->conwithoutoverlaps, &buf);
 
 				appendStringInfoChar(&buf, ')');
 
@@ -2575,7 +2575,7 @@ pg_get_constraintdef_worker(Oid constraintId, bool fullCommand,
  */
 static int
 decompile_column_index_array(Datum column_index_array, Oid relId,
-							 StringInfo buf)
+							 bool withoutOverlaps, StringInfo buf)
 {
 	Datum	   *keys;
 	int			nKeys;
@@ -2596,6 +2596,8 @@ decompile_column_index_array(Datum column_index_array, Oid relId,
 		else
 			appendStringInfo(buf, ", %s", quote_identifier(colName));
 	}
+	if (withoutOverlaps)
+		appendStringInfoString(buf, " WITHOUT OVERLAPS");
 
 	return nKeys;
 }
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index 20273f0be16..66e19b9f6da 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -5568,11 +5568,14 @@ RelationGetIdentityKeyBitmap(Relation relation)
 /*
  * RelationGetExclusionInfo -- get info about index's exclusion constraint
  *
- * This should be called only for an index that is known to have an
- * associated exclusion constraint.  It returns arrays (palloc'd in caller's
- * context) of the exclusion operator OIDs, their underlying functions'
- * OIDs, and their strategy numbers in the index's opclasses.  We cache
- * all this information since it requires a fair amount of work to get.
+ * This should be called only for an index that is known to have an associated
+ * exclusion constraint or primary key/unique constraint using WITHOUT
+ * OVERLAPS.
+
+ * It returns arrays (palloc'd in caller's context) of the exclusion operator
+ * OIDs, their underlying functions' OIDs, and their strategy numbers in the
+ * index's opclasses.  We cache all this information since it requires a fair
+ * amount of work to get.
  */
 void
 RelationGetExclusionInfo(Relation indexRelation,
@@ -5636,7 +5639,10 @@ RelationGetExclusionInfo(Relation indexRelation,
 		int			nelem;
 
 		/* We want the exclusion constraint owning the index */
-		if (conform->contype != CONSTRAINT_EXCLUSION ||
+		if ((conform->contype != CONSTRAINT_EXCLUSION &&
+					!(conform->conwithoutoverlaps && (
+							conform->contype == CONSTRAINT_PRIMARY
+							|| conform->contype == CONSTRAINT_UNIQUE))) ||
 			conform->conindid != RelationGetRelid(indexRelation))
 			continue;
 
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index 22d1e6cf922..13da2453a11 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -7233,6 +7233,7 @@ getIndexes(Archive *fout, TableInfo tblinfo[], int numTables)
 				i_conname,
 				i_condeferrable,
 				i_condeferred,
+				i_conwithoutoverlaps,
 				i_contableoid,
 				i_conoid,
 				i_condef,
@@ -7314,10 +7315,17 @@ getIndexes(Archive *fout, TableInfo tblinfo[], int numTables)
 
 	if (fout->remoteVersion >= 150000)
 		appendPQExpBufferStr(query,
-							 "i.indnullsnotdistinct ");
+							 "i.indnullsnotdistinct, ");
 	else
 		appendPQExpBufferStr(query,
-							 "false AS indnullsnotdistinct ");
+							 "false AS indnullsnotdistinct, ");
+
+	if (fout->remoteVersion >= 170000)
+		appendPQExpBufferStr(query,
+							 "c.conwithoutoverlaps ");
+	else
+		appendPQExpBufferStr(query,
+							 "NULL AS conwithoutoverlaps ");
 
 	/*
 	 * The point of the messy-looking outer join is to find a constraint that
@@ -7385,6 +7393,7 @@ getIndexes(Archive *fout, TableInfo tblinfo[], int numTables)
 	i_conname = PQfnumber(res, "conname");
 	i_condeferrable = PQfnumber(res, "condeferrable");
 	i_condeferred = PQfnumber(res, "condeferred");
+	i_conwithoutoverlaps = PQfnumber(res, "conwithoutoverlaps");
 	i_contableoid = PQfnumber(res, "contableoid");
 	i_conoid = PQfnumber(res, "conoid");
 	i_condef = PQfnumber(res, "condef");
@@ -7492,6 +7501,7 @@ getIndexes(Archive *fout, TableInfo tblinfo[], int numTables)
 				constrinfo->conindex = indxinfo[j].dobj.dumpId;
 				constrinfo->condeferrable = *(PQgetvalue(res, j, i_condeferrable)) == 't';
 				constrinfo->condeferred = *(PQgetvalue(res, j, i_condeferred)) == 't';
+				constrinfo->conwithoutoverlaps = *(PQgetvalue(res, j, i_conwithoutoverlaps)) == 't';
 				constrinfo->conislocal = true;
 				constrinfo->separate = true;
 
@@ -17200,6 +17210,8 @@ dumpConstraint(Archive *fout, const ConstraintInfo *coninfo)
 								  (k == 0) ? "" : ", ",
 								  fmtId(attname));
 			}
+			if (coninfo->conwithoutoverlaps)
+				appendPQExpBufferStr(q, " WITHOUT OVERLAPS");
 
 			if (indxinfo->indnkeyattrs < indxinfo->indnattrs)
 				appendPQExpBufferStr(q, ") INCLUDE (");
diff --git a/src/bin/pg_dump/pg_dump.h b/src/bin/pg_dump/pg_dump.h
index 9a34347cfc7..d1a6dc07232 100644
--- a/src/bin/pg_dump/pg_dump.h
+++ b/src/bin/pg_dump/pg_dump.h
@@ -489,6 +489,7 @@ typedef struct _constraintInfo
 	DumpId		conindex;		/* identifies associated index if any */
 	bool		condeferrable;	/* true if constraint is DEFERRABLE */
 	bool		condeferred;	/* true if constraint is INITIALLY DEFERRED */
+	bool		conwithoutoverlaps;	/* true if the constraint is WITHOUT OVERLAPS */
 	bool		conislocal;		/* true if constraint has local definition */
 	bool		separate;		/* true if must dump as separate item */
 } ConstraintInfo;
diff --git a/src/bin/pg_dump/t/002_pg_dump.pl b/src/bin/pg_dump/t/002_pg_dump.pl
index 3912dbf481a..4a4d81c4d9f 100644
--- a/src/bin/pg_dump/t/002_pg_dump.pl
+++ b/src/bin/pg_dump/t/002_pg_dump.pl
@@ -1015,6 +1015,46 @@ my %tests = (
 		},
 	},
 
+	'CONSTRAINT PRIMARY KEY / WITHOUT OVERLAPS' => {
+		create_sql  => 'CREATE TABLE dump_test.test_table_tpk (
+							col1 int4range,
+							col2 tstzrange,
+							CONSTRAINT test_table_tpk_pkey PRIMARY KEY (col1, col2 WITHOUT OVERLAPS));',
+		regexp => qr/^
+			\QALTER TABLE ONLY dump_test.test_table_tpk\E \n^\s+
+			\QADD CONSTRAINT test_table_tpk_pkey PRIMARY KEY (col1, col2 WITHOUT OVERLAPS);\E
+			/xm,
+		like => {
+			%full_runs,
+			%dump_test_schema_runs,
+			section_post_data  => 1,
+		},
+		unlike => {
+			exclude_dump_test_schema => 1,
+			only_dump_measurement    => 1,
+		},
+	},
+
+	'CONSTRAINT UNIQUE / WITHOUT OVERLAPS' => {
+		create_sql  => 'CREATE TABLE dump_test.test_table_tuq (
+							col1 int4range,
+							col2 tstzrange,
+							CONSTRAINT test_table_tuq_uq UNIQUE (col1, col2 WITHOUT OVERLAPS));',
+		regexp => qr/^
+			\QALTER TABLE ONLY dump_test.test_table_tuq\E \n^\s+
+			\QADD CONSTRAINT test_table_tuq_uq UNIQUE (col1, col2 WITHOUT OVERLAPS);\E
+			/xm,
+		like => {
+			%full_runs,
+			%dump_test_schema_runs,
+			section_post_data  => 1,
+		},
+		unlike => {
+			exclude_dump_test_schema => 1,
+			only_dump_measurement    => 1,
+		},
+	},
+
 	'ALTER TABLE (partitioned) ADD CONSTRAINT ... FOREIGN KEY' => {
 		create_order => 4,
 		create_sql => 'CREATE TABLE dump_test.test_table_fk (
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index 37f95163201..3f8bff59548 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -2379,6 +2379,10 @@ describeOneTableDetails(const char *schemaname,
 			else
 				appendPQExpBufferStr(&buf, ", false AS indisreplident");
 			appendPQExpBufferStr(&buf, ", c2.reltablespace");
+			if (pset.sversion >= 170000)
+				appendPQExpBufferStr(&buf, ", con.conwithoutoverlaps");
+			else
+				appendPQExpBufferStr(&buf, ", false AS conwithoutoverlaps");
 			appendPQExpBuffer(&buf,
 							  "\nFROM pg_catalog.pg_class c, pg_catalog.pg_class c2, pg_catalog.pg_index i\n"
 							  "  LEFT JOIN pg_catalog.pg_constraint con ON (conrelid = i.indrelid AND conindid = i.indexrelid AND contype IN ('p','u','x'))\n"
@@ -2400,8 +2404,12 @@ describeOneTableDetails(const char *schemaname,
 					printfPQExpBuffer(&buf, "    \"%s\"",
 									  PQgetvalue(result, i, 0));
 
-					/* If exclusion constraint, print the constraintdef */
-					if (strcmp(PQgetvalue(result, i, 7), "x") == 0)
+					/*
+					 * If exclusion constraint or PK/UNIQUE constraint WITHOUT
+					 * OVERLAPS, print the constraintdef
+					 */
+					if (strcmp(PQgetvalue(result, i, 7), "x") == 0 ||
+							strcmp(PQgetvalue(result, i, 12), "t") == 0)
 					{
 						appendPQExpBuffer(&buf, " %s",
 										  PQgetvalue(result, i, 6));
diff --git a/src/include/access/gist_private.h b/src/include/access/gist_private.h
index 7b8749c8db0..2af7fbacbac 100644
--- a/src/include/access/gist_private.h
+++ b/src/include/access/gist_private.h
@@ -532,6 +532,7 @@ extern void gistMakeUnionKey(GISTSTATE *giststate, int attno,
 							 Datum *dst, bool *dstisnull);
 
 extern XLogRecPtr gistGetFakeLSN(Relation rel);
+extern StrategyNumber gistTranslateStratnum(Oid opclass, StrategyNumber strat);
 
 /* gistvacuum.c */
 extern IndexBulkDeleteResult *gistbulkdelete(IndexVacuumInfo *info,
diff --git a/src/include/access/stratnum.h b/src/include/access/stratnum.h
index 8a47d3c9ec8..eaf3bb02764 100644
--- a/src/include/access/stratnum.h
+++ b/src/include/access/stratnum.h
@@ -22,6 +22,7 @@
 typedef uint16 StrategyNumber;
 
 #define InvalidStrategy ((StrategyNumber) 0)
+#define StrategyIsValid(stratnum) ((bool) ((stratnum) != InvalidStrategy))
 
 /*
  * Strategy numbers for B-tree indexes.
diff --git a/src/include/catalog/index.h b/src/include/catalog/index.h
index 99dab5940bc..2ef8512dbff 100644
--- a/src/include/catalog/index.h
+++ b/src/include/catalog/index.h
@@ -92,6 +92,7 @@ extern Oid	index_create(Relation heapRelation,
 #define	INDEX_CONSTR_CREATE_INIT_DEFERRED	(1 << 2)
 #define	INDEX_CONSTR_CREATE_UPDATE_INDEX	(1 << 3)
 #define	INDEX_CONSTR_CREATE_REMOVE_OLD_DEPS	(1 << 4)
+#define	INDEX_CONSTR_CREATE_WITHOUT_OVERLAPS (1 << 5)
 
 extern Oid	index_concurrently_create_copy(Relation heapRelation,
 										   Oid oldIndexId,
diff --git a/src/include/catalog/pg_constraint.h b/src/include/catalog/pg_constraint.h
index d79432e142b..8fd76a94d78 100644
--- a/src/include/catalog/pg_constraint.h
+++ b/src/include/catalog/pg_constraint.h
@@ -107,6 +107,12 @@ CATALOG(pg_constraint,2606,ConstraintRelationId)
 	/* Has a local definition and cannot be inherited */
 	bool		connoinherit;
 
+	/*
+	 * For primary keys and unique constraints, signifies the last column uses
+	 * overlaps instead of equals.
+	 */
+	bool		conwithoutoverlaps;
+
 #ifdef CATALOG_VARLEN			/* variable-length fields start here */
 
 	/*
@@ -146,7 +152,8 @@ CATALOG(pg_constraint,2606,ConstraintRelationId)
 
 	/*
 	 * If an exclusion constraint, the OIDs of the exclusion operators for
-	 * each column of the constraint
+	 * each column of the constraint.  Also set for unique constraints/primary
+	 * keys using WITHOUT OVERLAPS.
 	 */
 	Oid			conexclop[1] BKI_LOOKUP(pg_operator);
 
@@ -236,6 +243,7 @@ extern Oid	CreateConstraintEntry(const char *constraintName,
 								  bool conIsLocal,
 								  int conInhCount,
 								  bool conNoInherit,
+								  bool conWithoutOverlaps,
 								  bool is_internal);
 
 extern bool ConstraintNameIsUsed(ConstraintCategory conCat, Oid objId,
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index 29c511e3196..b25ff2a8773 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -14,6 +14,7 @@
 #ifndef DEFREM_H
 #define DEFREM_H
 
+#include "access/stratnum.h"
 #include "catalog/objectaddress.h"
 #include "nodes/params.h"
 #include "parser/parse_node.h"
@@ -44,10 +45,14 @@ extern char *ChooseRelationName(const char *name1, const char *name2,
 extern bool CheckIndexCompatible(Oid oldId,
 								 const char *accessMethodName,
 								 const List *attributeList,
-								 const List *exclusionOpNames);
+								 const List *exclusionOpNames,
+								 bool isWithoutOverlaps);
 extern Oid	GetDefaultOpClass(Oid type_id, Oid am_id);
 extern Oid	ResolveOpClass(const List *opclass, Oid attrType,
 						   const char *accessMethodName, Oid accessMethodId);
+extern void GetOperatorFromCanonicalStrategy(Oid opclass, Oid atttype,
+											 const char *opname, Oid *opid,
+											 StrategyNumber *strat);
 
 /* commands/functioncmds.c */
 extern ObjectAddress CreateFunction(ParseState *pstate, CreateFunctionStmt *stmt);
diff --git a/src/include/nodes/parsenodes.h b/src/include/nodes/parsenodes.h
index b3181f34aee..476d55dd240 100644
--- a/src/include/nodes/parsenodes.h
+++ b/src/include/nodes/parsenodes.h
@@ -2590,6 +2590,7 @@ typedef struct Constraint
 	bool		nulls_not_distinct; /* null treatment for UNIQUE constraints */
 	List	   *keys;			/* String nodes naming referenced key
 								 * column(s); also used for NOT NULL */
+	bool		without_overlaps;	/* WITHOUT OVERLAPS specified */
 	List	   *including;		/* String nodes naming referenced nonkey
 								 * column(s) */
 
@@ -3219,6 +3220,7 @@ typedef struct IndexStmt
 	bool		nulls_not_distinct; /* null treatment for UNIQUE constraints */
 	bool		primary;		/* is index a primary key? */
 	bool		isconstraint;	/* is it for a pkey/unique constraint? */
+	bool		iswithoutoverlaps;	/* is the constraint WITHOUT OVERLAPS? */
 	bool		deferrable;		/* is the constraint DEFERRABLE? */
 	bool		initdeferred;	/* is the constraint INITIALLY DEFERRED? */
 	bool		transformed;	/* true when transformIndexStmt is finished */
diff --git a/src/test/regress/expected/without_overlaps.out b/src/test/regress/expected/without_overlaps.out
new file mode 100644
index 00000000000..726e94102bf
--- /dev/null
+++ b/src/test/regress/expected/without_overlaps.out
@@ -0,0 +1,395 @@
+-- Tests for WITHOUT OVERLAPS.
+--
+-- We leave behind several tables to test pg_dump etc:
+-- temporal_rng, temporal_rng2,
+-- temporal_fk_rng2rng.
+--
+-- test input parser
+--
+-- PK with no columns just WITHOUT OVERLAPS:
+CREATE TABLE temporal_rng (
+	valid_at tsrange,
+	CONSTRAINT temporal_rng_pk PRIMARY KEY (valid_at WITHOUT OVERLAPS)
+);
+ERROR:  constraint using WITHOUT OVERLAPS needs at least two columns
+-- PK with a range column/PERIOD that isn't there:
+CREATE TABLE temporal_rng (
+	id INTEGER,
+	CONSTRAINT temporal_rng_pk PRIMARY KEY (id, valid_at WITHOUT OVERLAPS)
+);
+ERROR:  column "valid_at" named in key does not exist
+LINE 3:  CONSTRAINT temporal_rng_pk PRIMARY KEY (id, valid_at WITHOU...
+         ^
+-- PK with a non-range column:
+CREATE TABLE temporal_rng (
+	id int4range,
+	valid_at TEXT,
+	CONSTRAINT temporal_rng_pk PRIMARY KEY (id, valid_at WITHOUT OVERLAPS)
+);
+ERROR:  data type text has no default operator class for access method "gist"
+HINT:  You must specify an operator class for the index or define a default operator class for the data type.
+-- PK with one column plus a range:
+CREATE TABLE temporal_rng (
+	-- Since we can't depend on having btree_gist here,
+	-- use an int4range instead of an int.
+	-- (The rangetypes regression test uses the same trick.)
+	id int4range,
+	valid_at tsrange,
+	CONSTRAINT temporal_rng_pk PRIMARY KEY (id, valid_at WITHOUT OVERLAPS)
+);
+\d temporal_rng
+              Table "public.temporal_rng"
+  Column  |   Type    | Collation | Nullable | Default 
+----------+-----------+-----------+----------+---------
+ id       | int4range |           | not null | 
+ valid_at | tsrange   |           | not null | 
+Indexes:
+    "temporal_rng_pk" PRIMARY KEY (id, valid_at WITHOUT OVERLAPS)
+
+SELECT pg_get_constraintdef(oid) FROM pg_constraint WHERE conname = 'temporal_rng_pk';
+            pg_get_constraintdef             
+---------------------------------------------
+ PRIMARY KEY (id, valid_at WITHOUT OVERLAPS)
+(1 row)
+
+SELECT pg_get_indexdef(conindid, 0, true) FROM pg_constraint WHERE conname = 'temporal_rng_pk';
+                                pg_get_indexdef                                
+-------------------------------------------------------------------------------
+ CREATE UNIQUE INDEX temporal_rng_pk ON temporal_rng USING gist (id, valid_at)
+(1 row)
+
+-- PK with two columns plus a range:
+-- We don't drop this table because tests below also need multiple scalar columns.
+CREATE TABLE temporal_rng2 (
+	id1 int4range,
+	id2 int4range,
+	valid_at tsrange,
+	CONSTRAINT temporal_rng2_pk PRIMARY KEY (id1, id2, valid_at WITHOUT OVERLAPS)
+);
+\d temporal_rng2
+             Table "public.temporal_rng2"
+  Column  |   Type    | Collation | Nullable | Default 
+----------+-----------+-----------+----------+---------
+ id1      | int4range |           | not null | 
+ id2      | int4range |           | not null | 
+ valid_at | tsrange   |           | not null | 
+Indexes:
+    "temporal_rng2_pk" PRIMARY KEY (id1, id2, valid_at WITHOUT OVERLAPS)
+
+SELECT pg_get_constraintdef(oid) FROM pg_constraint WHERE conname = 'temporal_rng2_pk';
+               pg_get_constraintdef                
+---------------------------------------------------
+ PRIMARY KEY (id1, id2, valid_at WITHOUT OVERLAPS)
+(1 row)
+
+SELECT pg_get_indexdef(conindid, 0, true) FROM pg_constraint WHERE conname = 'temporal_rng2_pk';
+                                    pg_get_indexdef                                    
+---------------------------------------------------------------------------------------
+ CREATE UNIQUE INDEX temporal_rng2_pk ON temporal_rng2 USING gist (id1, id2, valid_at)
+(1 row)
+
+-- PK with a custom range type:
+CREATE TYPE textrange2 AS range (subtype=text, collation="C");
+CREATE TABLE temporal_rng3 (
+	id int4range,
+	valid_at textrange2,
+	CONSTRAINT temporal_rng3_pk PRIMARY KEY (id, valid_at WITHOUT OVERLAPS)
+);
+ALTER TABLE temporal_rng3 DROP CONSTRAINT temporal_rng3_pk;
+DROP TABLE temporal_rng3;
+DROP TYPE textrange2;
+-- PK with a multirange:
+CREATE TABLE temporal_mltrng (
+  id int4range,
+  valid_at tsmultirange,
+  CONSTRAINT temporal_mltrng_pk PRIMARY KEY (id, valid_at WITHOUT OVERLAPS)
+);
+\d temporal_mltrng
+              Table "public.temporal_mltrng"
+  Column  |     Type     | Collation | Nullable | Default 
+----------+--------------+-----------+----------+---------
+ id       | int4range    |           | not null | 
+ valid_at | tsmultirange |           | not null | 
+Indexes:
+    "temporal_mltrng_pk" PRIMARY KEY (id, valid_at WITHOUT OVERLAPS)
+
+-- UNIQUE with no columns just WITHOUT OVERLAPS:
+CREATE TABLE temporal_rng3 (
+	valid_at tsrange,
+	CONSTRAINT temporal_rng3_uq UNIQUE (valid_at WITHOUT OVERLAPS)
+);
+ERROR:  constraint using WITHOUT OVERLAPS needs at least two columns
+-- UNIQUE with a range column/PERIOD that isn't there:
+CREATE TABLE temporal_rng3 (
+	id INTEGER,
+	CONSTRAINT temporal_rng3_uq UNIQUE (id, valid_at WITHOUT OVERLAPS)
+);
+ERROR:  column "valid_at" named in key does not exist
+LINE 3:  CONSTRAINT temporal_rng3_uq UNIQUE (id, valid_at WITHOUT OV...
+         ^
+-- UNIQUE with a non-range column:
+CREATE TABLE temporal_rng3 (
+	id int4range,
+	valid_at TEXT,
+	CONSTRAINT temporal_rng3_uq UNIQUE (id, valid_at WITHOUT OVERLAPS)
+);
+ERROR:  data type text has no default operator class for access method "gist"
+HINT:  You must specify an operator class for the index or define a default operator class for the data type.
+-- UNIQUE with one column plus a range:
+CREATE TABLE temporal_rng3 (
+	id int4range,
+	valid_at tsrange,
+	CONSTRAINT temporal_rng3_uq UNIQUE (id, valid_at WITHOUT OVERLAPS)
+);
+\d temporal_rng3
+             Table "public.temporal_rng3"
+  Column  |   Type    | Collation | Nullable | Default 
+----------+-----------+-----------+----------+---------
+ id       | int4range |           |          | 
+ valid_at | tsrange   |           |          | 
+Indexes:
+    "temporal_rng3_uq" UNIQUE (id, valid_at WITHOUT OVERLAPS)
+
+SELECT pg_get_constraintdef(oid) FROM pg_constraint WHERE conname = 'temporal_rng3_uq';
+          pg_get_constraintdef          
+----------------------------------------
+ UNIQUE (id, valid_at WITHOUT OVERLAPS)
+(1 row)
+
+SELECT pg_get_indexdef(conindid, 0, true) FROM pg_constraint WHERE conname = 'temporal_rng3_uq';
+                                 pg_get_indexdef                                 
+---------------------------------------------------------------------------------
+ CREATE UNIQUE INDEX temporal_rng3_uq ON temporal_rng3 USING gist (id, valid_at)
+(1 row)
+
+DROP TABLE temporal_rng3;
+-- UNIQUE with two columns plus a range:
+CREATE TABLE temporal_rng3 (
+	id1 int4range,
+	id2 int4range,
+	valid_at tsrange,
+	CONSTRAINT temporal_rng3_uq UNIQUE (id1, id2, valid_at WITHOUT OVERLAPS)
+);
+\d temporal_rng3
+             Table "public.temporal_rng3"
+  Column  |   Type    | Collation | Nullable | Default 
+----------+-----------+-----------+----------+---------
+ id1      | int4range |           |          | 
+ id2      | int4range |           |          | 
+ valid_at | tsrange   |           |          | 
+Indexes:
+    "temporal_rng3_uq" UNIQUE (id1, id2, valid_at WITHOUT OVERLAPS)
+
+SELECT pg_get_constraintdef(oid) FROM pg_constraint WHERE conname = 'temporal_rng3_uq';
+             pg_get_constraintdef             
+----------------------------------------------
+ UNIQUE (id1, id2, valid_at WITHOUT OVERLAPS)
+(1 row)
+
+SELECT pg_get_indexdef(conindid, 0, true) FROM pg_constraint WHERE conname = 'temporal_rng3_uq';
+                                    pg_get_indexdef                                    
+---------------------------------------------------------------------------------------
+ CREATE UNIQUE INDEX temporal_rng3_uq ON temporal_rng3 USING gist (id1, id2, valid_at)
+(1 row)
+
+DROP TABLE temporal_rng3;
+-- UNIQUE with a custom range type:
+CREATE TYPE textrange2 AS range (subtype=text, collation="C");
+CREATE TABLE temporal_rng3 (
+	id int4range,
+	valid_at textrange2,
+	CONSTRAINT temporal_rng3_uq UNIQUE (id, valid_at WITHOUT OVERLAPS)
+);
+ALTER TABLE temporal_rng3 DROP CONSTRAINT temporal_rng3_uq;
+DROP TABLE temporal_rng3;
+DROP TYPE textrange2;
+--
+-- test ALTER TABLE ADD CONSTRAINT
+--
+DROP TABLE temporal_rng;
+CREATE TABLE temporal_rng (
+	id int4range,
+	valid_at tsrange
+);
+ALTER TABLE temporal_rng
+	ADD CONSTRAINT temporal_rng_pk
+	PRIMARY KEY (id, valid_at WITHOUT OVERLAPS);
+-- PK with USING INDEX (not possible):
+CREATE TABLE temporal3 (
+	id int4range,
+	valid_at tsrange
+);
+CREATE INDEX idx_temporal3_uq ON temporal3 USING gist (id, valid_at);
+ALTER TABLE temporal3
+	ADD CONSTRAINT temporal3_pk
+	PRIMARY KEY USING INDEX idx_temporal3_uq;
+ERROR:  "idx_temporal3_uq" is not a unique index
+LINE 2:  ADD CONSTRAINT temporal3_pk
+             ^
+DETAIL:  Cannot create a primary key or unique constraint using such an index.
+DROP TABLE temporal3;
+-- UNIQUE with USING INDEX (not possible):
+CREATE TABLE temporal3 (
+	id int4range,
+	valid_at tsrange
+);
+CREATE INDEX idx_temporal3_uq ON temporal3 USING gist (id, valid_at);
+ALTER TABLE temporal3
+	ADD CONSTRAINT temporal3_uq
+	UNIQUE USING INDEX idx_temporal3_uq;
+ERROR:  "idx_temporal3_uq" is not a unique index
+LINE 2:  ADD CONSTRAINT temporal3_uq
+             ^
+DETAIL:  Cannot create a primary key or unique constraint using such an index.
+DROP TABLE temporal3;
+-- UNIQUE with USING [UNIQUE] INDEX (possible but not a temporal constraint):
+CREATE TABLE temporal3 (
+	id int4range,
+	valid_at tsrange
+);
+CREATE UNIQUE INDEX idx_temporal3_uq ON temporal3 (id, valid_at);
+ALTER TABLE temporal3
+	ADD CONSTRAINT temporal3_uq
+	UNIQUE USING INDEX idx_temporal3_uq;
+NOTICE:  ALTER TABLE / ADD CONSTRAINT USING INDEX will rename index "idx_temporal3_uq" to "temporal3_uq"
+DROP TABLE temporal3;
+-- Add range column and the PK at the same time
+CREATE TABLE temporal3 (
+	id int4range
+);
+ALTER TABLE temporal3
+	ADD COLUMN valid_at tsrange,
+	ADD CONSTRAINT temporal3_pk
+	PRIMARY KEY (id, valid_at WITHOUT OVERLAPS);
+DROP TABLE temporal3;
+-- Add range column and UNIQUE constraint at the same time
+CREATE TABLE temporal3 (
+	id int4range
+);
+ALTER TABLE temporal3
+	ADD COLUMN valid_at tsrange,
+	ADD CONSTRAINT temporal3_uq
+	UNIQUE (id, valid_at WITHOUT OVERLAPS);
+DROP TABLE temporal3;
+--
+-- test PK inserts
+--
+-- okay:
+INSERT INTO temporal_rng VALUES ('[1,1]', tsrange('2018-01-02', '2018-02-03'));
+INSERT INTO temporal_rng VALUES ('[1,1]', tsrange('2018-03-03', '2018-04-04'));
+INSERT INTO temporal_rng VALUES ('[2,2]', tsrange('2018-01-01', '2018-01-05'));
+INSERT INTO temporal_rng VALUES ('[3,3]', tsrange('2018-01-01', NULL));
+-- should fail:
+INSERT INTO temporal_rng VALUES ('[1,1]', tsrange('2018-01-01', '2018-01-05'));
+ERROR:  conflicting key value violates exclusion constraint "temporal_rng_pk"
+DETAIL:  Key (id, valid_at)=([1,2), ["Mon Jan 01 00:00:00 2018","Fri Jan 05 00:00:00 2018")) conflicts with existing key (id, valid_at)=([1,2), ["Tue Jan 02 00:00:00 2018","Sat Feb 03 00:00:00 2018")).
+INSERT INTO temporal_rng VALUES (NULL, tsrange('2018-01-01', '2018-01-05'));
+ERROR:  null value in column "id" of relation "temporal_rng" violates not-null constraint
+DETAIL:  Failing row contains (null, ["Mon Jan 01 00:00:00 2018","Fri Jan 05 00:00:00 2018")).
+INSERT INTO temporal_rng VALUES ('[3,3]', NULL);
+ERROR:  null value in column "valid_at" of relation "temporal_rng" violates not-null constraint
+DETAIL:  Failing row contains ([3,4), null).
+--
+-- test a range with both a PK and a UNIQUE constraint
+--
+CREATE TABLE temporal3 (
+  id int4range,
+  valid_at daterange,
+  id2 int8range,
+  name TEXT,
+  CONSTRAINT temporal3_pk PRIMARY KEY (id, valid_at WITHOUT OVERLAPS),
+  CONSTRAINT temporal3_uniq UNIQUE (id2, valid_at WITHOUT OVERLAPS)
+);
+INSERT INTO temporal3 (id, valid_at, id2, name)
+  VALUES
+  ('[1,1]', daterange('2000-01-01', '2010-01-01'), '[7,7]', 'foo'),
+  ('[2,2]', daterange('2000-01-01', '2010-01-01'), '[9,9]', 'bar')
+;
+DROP TABLE temporal3;
+--
+-- test changing the PK's dependencies
+--
+CREATE TABLE temporal3 (
+	id int4range,
+	valid_at tsrange,
+	CONSTRAINT temporal3_pk PRIMARY KEY (id, valid_at WITHOUT OVERLAPS)
+);
+ALTER TABLE temporal3 ALTER COLUMN valid_at DROP NOT NULL;
+ERROR:  column "valid_at" is in a primary key
+ALTER TABLE temporal3 ALTER COLUMN valid_at TYPE tstzrange USING tstzrange(lower(valid_at), upper(valid_at));
+ALTER TABLE temporal3 RENAME COLUMN valid_at TO valid_thru;
+ALTER TABLE temporal3 DROP COLUMN valid_thru;
+DROP TABLE temporal3;
+--
+-- test PARTITION BY for ranges
+--
+-- temporal PRIMARY KEY:
+CREATE TABLE temporal_partitioned (
+	id int4range,
+	valid_at daterange,
+  name text,
+	CONSTRAINT temporal_paritioned_pk PRIMARY KEY (id, valid_at WITHOUT OVERLAPS)
+) PARTITION BY LIST (id);
+CREATE TABLE tp1 PARTITION OF temporal_partitioned FOR VALUES IN ('[1,1]', '[2,2]');
+CREATE TABLE tp2 PARTITION OF temporal_partitioned FOR VALUES IN ('[3,3]', '[4,4]');
+INSERT INTO temporal_partitioned VALUES
+  ('[1,1]', daterange('2000-01-01', '2000-02-01'), 'one'),
+  ('[1,1]', daterange('2000-02-01', '2000-03-01'), 'one'),
+  ('[3,3]', daterange('2000-01-01', '2010-01-01'), 'three');
+SELECT * FROM temporal_partitioned ORDER BY id, valid_at;
+  id   |        valid_at         | name  
+-------+-------------------------+-------
+ [1,2) | [01-01-2000,02-01-2000) | one
+ [1,2) | [02-01-2000,03-01-2000) | one
+ [3,4) | [01-01-2000,01-01-2010) | three
+(3 rows)
+
+SELECT * FROM tp1 ORDER BY id, valid_at;
+  id   |        valid_at         | name 
+-------+-------------------------+------
+ [1,2) | [01-01-2000,02-01-2000) | one
+ [1,2) | [02-01-2000,03-01-2000) | one
+(2 rows)
+
+SELECT * FROM tp2 ORDER BY id, valid_at;
+  id   |        valid_at         | name  
+-------+-------------------------+-------
+ [3,4) | [01-01-2000,01-01-2010) | three
+(1 row)
+
+DROP TABLE temporal_partitioned;
+-- temporal UNIQUE:
+CREATE TABLE temporal_partitioned (
+	id int4range,
+	valid_at daterange,
+  name text,
+	CONSTRAINT temporal_paritioned_uq UNIQUE (id, valid_at WITHOUT OVERLAPS)
+) PARTITION BY LIST (id);
+CREATE TABLE tp1 PARTITION OF temporal_partitioned FOR VALUES IN ('[1,1]', '[2,2]');
+CREATE TABLE tp2 PARTITION OF temporal_partitioned FOR VALUES IN ('[3,3]', '[4,4]');
+INSERT INTO temporal_partitioned VALUES
+  ('[1,1]', daterange('2000-01-01', '2000-02-01'), 'one'),
+  ('[1,1]', daterange('2000-02-01', '2000-03-01'), 'one'),
+  ('[3,3]', daterange('2000-01-01', '2010-01-01'), 'three');
+SELECT * FROM temporal_partitioned ORDER BY id, valid_at;
+  id   |        valid_at         | name  
+-------+-------------------------+-------
+ [1,2) | [01-01-2000,02-01-2000) | one
+ [1,2) | [02-01-2000,03-01-2000) | one
+ [3,4) | [01-01-2000,01-01-2010) | three
+(3 rows)
+
+SELECT * FROM tp1 ORDER BY id, valid_at;
+  id   |        valid_at         | name 
+-------+-------------------------+------
+ [1,2) | [01-01-2000,02-01-2000) | one
+ [1,2) | [02-01-2000,03-01-2000) | one
+(2 rows)
+
+SELECT * FROM tp2 ORDER BY id, valid_at;
+  id   |        valid_at         | name  
+-------+-------------------------+-------
+ [3,4) | [01-01-2000,01-01-2010) | three
+(1 row)
+
+DROP TABLE temporal_partitioned;
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index f0987ff537b..b08aaae44b8 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -78,7 +78,7 @@ test: brin_bloom brin_multi
 # psql depends on create_am
 # amutils depends on geometry, create_index_spgist, hash_index, brin
 # ----------
-test: create_table_like alter_generic alter_operator misc async dbsize merge misc_functions sysviews tsrf tid tidscan tidrangescan collate.icu.utf8 incremental_sort create_role
+test: create_table_like alter_generic alter_operator misc async dbsize merge misc_functions sysviews tsrf tid tidscan tidrangescan collate.icu.utf8 incremental_sort create_role without_overlaps
 
 # collate.*.utf8 tests cannot be run in parallel with each other
 test: rules psql psql_crosstab amutils stats_ext collate.linux.utf8 collate.windows.win1252
diff --git a/src/test/regress/sql/without_overlaps.sql b/src/test/regress/sql/without_overlaps.sql
new file mode 100644
index 00000000000..c8e8ab994a0
--- /dev/null
+++ b/src/test/regress/sql/without_overlaps.sql
@@ -0,0 +1,290 @@
+-- Tests for WITHOUT OVERLAPS.
+--
+-- We leave behind several tables to test pg_dump etc:
+-- temporal_rng, temporal_rng2,
+-- temporal_fk_rng2rng.
+
+--
+-- test input parser
+--
+
+-- PK with no columns just WITHOUT OVERLAPS:
+
+CREATE TABLE temporal_rng (
+	valid_at tsrange,
+	CONSTRAINT temporal_rng_pk PRIMARY KEY (valid_at WITHOUT OVERLAPS)
+);
+
+-- PK with a range column/PERIOD that isn't there:
+
+CREATE TABLE temporal_rng (
+	id INTEGER,
+	CONSTRAINT temporal_rng_pk PRIMARY KEY (id, valid_at WITHOUT OVERLAPS)
+);
+
+-- PK with a non-range column:
+
+CREATE TABLE temporal_rng (
+	id int4range,
+	valid_at TEXT,
+	CONSTRAINT temporal_rng_pk PRIMARY KEY (id, valid_at WITHOUT OVERLAPS)
+);
+
+-- PK with one column plus a range:
+
+CREATE TABLE temporal_rng (
+	-- Since we can't depend on having btree_gist here,
+	-- use an int4range instead of an int.
+	-- (The rangetypes regression test uses the same trick.)
+	id int4range,
+	valid_at tsrange,
+	CONSTRAINT temporal_rng_pk PRIMARY KEY (id, valid_at WITHOUT OVERLAPS)
+);
+\d temporal_rng
+SELECT pg_get_constraintdef(oid) FROM pg_constraint WHERE conname = 'temporal_rng_pk';
+SELECT pg_get_indexdef(conindid, 0, true) FROM pg_constraint WHERE conname = 'temporal_rng_pk';
+
+-- PK with two columns plus a range:
+-- We don't drop this table because tests below also need multiple scalar columns.
+CREATE TABLE temporal_rng2 (
+	id1 int4range,
+	id2 int4range,
+	valid_at tsrange,
+	CONSTRAINT temporal_rng2_pk PRIMARY KEY (id1, id2, valid_at WITHOUT OVERLAPS)
+);
+\d temporal_rng2
+SELECT pg_get_constraintdef(oid) FROM pg_constraint WHERE conname = 'temporal_rng2_pk';
+SELECT pg_get_indexdef(conindid, 0, true) FROM pg_constraint WHERE conname = 'temporal_rng2_pk';
+
+
+-- PK with a custom range type:
+CREATE TYPE textrange2 AS range (subtype=text, collation="C");
+CREATE TABLE temporal_rng3 (
+	id int4range,
+	valid_at textrange2,
+	CONSTRAINT temporal_rng3_pk PRIMARY KEY (id, valid_at WITHOUT OVERLAPS)
+);
+ALTER TABLE temporal_rng3 DROP CONSTRAINT temporal_rng3_pk;
+DROP TABLE temporal_rng3;
+DROP TYPE textrange2;
+
+-- PK with a multirange:
+CREATE TABLE temporal_mltrng (
+  id int4range,
+  valid_at tsmultirange,
+  CONSTRAINT temporal_mltrng_pk PRIMARY KEY (id, valid_at WITHOUT OVERLAPS)
+);
+\d temporal_mltrng
+
+-- UNIQUE with no columns just WITHOUT OVERLAPS:
+
+CREATE TABLE temporal_rng3 (
+	valid_at tsrange,
+	CONSTRAINT temporal_rng3_uq UNIQUE (valid_at WITHOUT OVERLAPS)
+);
+
+-- UNIQUE with a range column/PERIOD that isn't there:
+
+CREATE TABLE temporal_rng3 (
+	id INTEGER,
+	CONSTRAINT temporal_rng3_uq UNIQUE (id, valid_at WITHOUT OVERLAPS)
+);
+
+-- UNIQUE with a non-range column:
+
+CREATE TABLE temporal_rng3 (
+	id int4range,
+	valid_at TEXT,
+	CONSTRAINT temporal_rng3_uq UNIQUE (id, valid_at WITHOUT OVERLAPS)
+);
+
+-- UNIQUE with one column plus a range:
+
+CREATE TABLE temporal_rng3 (
+	id int4range,
+	valid_at tsrange,
+	CONSTRAINT temporal_rng3_uq UNIQUE (id, valid_at WITHOUT OVERLAPS)
+);
+\d temporal_rng3
+SELECT pg_get_constraintdef(oid) FROM pg_constraint WHERE conname = 'temporal_rng3_uq';
+SELECT pg_get_indexdef(conindid, 0, true) FROM pg_constraint WHERE conname = 'temporal_rng3_uq';
+DROP TABLE temporal_rng3;
+
+-- UNIQUE with two columns plus a range:
+CREATE TABLE temporal_rng3 (
+	id1 int4range,
+	id2 int4range,
+	valid_at tsrange,
+	CONSTRAINT temporal_rng3_uq UNIQUE (id1, id2, valid_at WITHOUT OVERLAPS)
+);
+\d temporal_rng3
+SELECT pg_get_constraintdef(oid) FROM pg_constraint WHERE conname = 'temporal_rng3_uq';
+SELECT pg_get_indexdef(conindid, 0, true) FROM pg_constraint WHERE conname = 'temporal_rng3_uq';
+DROP TABLE temporal_rng3;
+
+-- UNIQUE with a custom range type:
+CREATE TYPE textrange2 AS range (subtype=text, collation="C");
+CREATE TABLE temporal_rng3 (
+	id int4range,
+	valid_at textrange2,
+	CONSTRAINT temporal_rng3_uq UNIQUE (id, valid_at WITHOUT OVERLAPS)
+);
+ALTER TABLE temporal_rng3 DROP CONSTRAINT temporal_rng3_uq;
+DROP TABLE temporal_rng3;
+DROP TYPE textrange2;
+
+--
+-- test ALTER TABLE ADD CONSTRAINT
+--
+
+DROP TABLE temporal_rng;
+CREATE TABLE temporal_rng (
+	id int4range,
+	valid_at tsrange
+);
+ALTER TABLE temporal_rng
+	ADD CONSTRAINT temporal_rng_pk
+	PRIMARY KEY (id, valid_at WITHOUT OVERLAPS);
+
+-- PK with USING INDEX (not possible):
+CREATE TABLE temporal3 (
+	id int4range,
+	valid_at tsrange
+);
+CREATE INDEX idx_temporal3_uq ON temporal3 USING gist (id, valid_at);
+ALTER TABLE temporal3
+	ADD CONSTRAINT temporal3_pk
+	PRIMARY KEY USING INDEX idx_temporal3_uq;
+DROP TABLE temporal3;
+
+-- UNIQUE with USING INDEX (not possible):
+CREATE TABLE temporal3 (
+	id int4range,
+	valid_at tsrange
+);
+CREATE INDEX idx_temporal3_uq ON temporal3 USING gist (id, valid_at);
+ALTER TABLE temporal3
+	ADD CONSTRAINT temporal3_uq
+	UNIQUE USING INDEX idx_temporal3_uq;
+DROP TABLE temporal3;
+
+-- UNIQUE with USING [UNIQUE] INDEX (possible but not a temporal constraint):
+CREATE TABLE temporal3 (
+	id int4range,
+	valid_at tsrange
+);
+CREATE UNIQUE INDEX idx_temporal3_uq ON temporal3 (id, valid_at);
+ALTER TABLE temporal3
+	ADD CONSTRAINT temporal3_uq
+	UNIQUE USING INDEX idx_temporal3_uq;
+DROP TABLE temporal3;
+
+-- Add range column and the PK at the same time
+CREATE TABLE temporal3 (
+	id int4range
+);
+ALTER TABLE temporal3
+	ADD COLUMN valid_at tsrange,
+	ADD CONSTRAINT temporal3_pk
+	PRIMARY KEY (id, valid_at WITHOUT OVERLAPS);
+DROP TABLE temporal3;
+
+-- Add range column and UNIQUE constraint at the same time
+CREATE TABLE temporal3 (
+	id int4range
+);
+ALTER TABLE temporal3
+	ADD COLUMN valid_at tsrange,
+	ADD CONSTRAINT temporal3_uq
+	UNIQUE (id, valid_at WITHOUT OVERLAPS);
+DROP TABLE temporal3;
+
+--
+-- test PK inserts
+--
+
+-- okay:
+INSERT INTO temporal_rng VALUES ('[1,1]', tsrange('2018-01-02', '2018-02-03'));
+INSERT INTO temporal_rng VALUES ('[1,1]', tsrange('2018-03-03', '2018-04-04'));
+INSERT INTO temporal_rng VALUES ('[2,2]', tsrange('2018-01-01', '2018-01-05'));
+INSERT INTO temporal_rng VALUES ('[3,3]', tsrange('2018-01-01', NULL));
+
+-- should fail:
+INSERT INTO temporal_rng VALUES ('[1,1]', tsrange('2018-01-01', '2018-01-05'));
+INSERT INTO temporal_rng VALUES (NULL, tsrange('2018-01-01', '2018-01-05'));
+INSERT INTO temporal_rng VALUES ('[3,3]', NULL);
+
+--
+-- test a range with both a PK and a UNIQUE constraint
+--
+
+CREATE TABLE temporal3 (
+  id int4range,
+  valid_at daterange,
+  id2 int8range,
+  name TEXT,
+  CONSTRAINT temporal3_pk PRIMARY KEY (id, valid_at WITHOUT OVERLAPS),
+  CONSTRAINT temporal3_uniq UNIQUE (id2, valid_at WITHOUT OVERLAPS)
+);
+INSERT INTO temporal3 (id, valid_at, id2, name)
+  VALUES
+  ('[1,1]', daterange('2000-01-01', '2010-01-01'), '[7,7]', 'foo'),
+  ('[2,2]', daterange('2000-01-01', '2010-01-01'), '[9,9]', 'bar')
+;
+DROP TABLE temporal3;
+
+--
+-- test changing the PK's dependencies
+--
+
+CREATE TABLE temporal3 (
+	id int4range,
+	valid_at tsrange,
+	CONSTRAINT temporal3_pk PRIMARY KEY (id, valid_at WITHOUT OVERLAPS)
+);
+
+ALTER TABLE temporal3 ALTER COLUMN valid_at DROP NOT NULL;
+ALTER TABLE temporal3 ALTER COLUMN valid_at TYPE tstzrange USING tstzrange(lower(valid_at), upper(valid_at));
+ALTER TABLE temporal3 RENAME COLUMN valid_at TO valid_thru;
+ALTER TABLE temporal3 DROP COLUMN valid_thru;
+DROP TABLE temporal3;
+
+--
+-- test PARTITION BY for ranges
+--
+
+-- temporal PRIMARY KEY:
+CREATE TABLE temporal_partitioned (
+	id int4range,
+	valid_at daterange,
+  name text,
+	CONSTRAINT temporal_paritioned_pk PRIMARY KEY (id, valid_at WITHOUT OVERLAPS)
+) PARTITION BY LIST (id);
+CREATE TABLE tp1 PARTITION OF temporal_partitioned FOR VALUES IN ('[1,1]', '[2,2]');
+CREATE TABLE tp2 PARTITION OF temporal_partitioned FOR VALUES IN ('[3,3]', '[4,4]');
+INSERT INTO temporal_partitioned VALUES
+  ('[1,1]', daterange('2000-01-01', '2000-02-01'), 'one'),
+  ('[1,1]', daterange('2000-02-01', '2000-03-01'), 'one'),
+  ('[3,3]', daterange('2000-01-01', '2010-01-01'), 'three');
+SELECT * FROM temporal_partitioned ORDER BY id, valid_at;
+SELECT * FROM tp1 ORDER BY id, valid_at;
+SELECT * FROM tp2 ORDER BY id, valid_at;
+DROP TABLE temporal_partitioned;
+
+-- temporal UNIQUE:
+CREATE TABLE temporal_partitioned (
+	id int4range,
+	valid_at daterange,
+  name text,
+	CONSTRAINT temporal_paritioned_uq UNIQUE (id, valid_at WITHOUT OVERLAPS)
+) PARTITION BY LIST (id);
+CREATE TABLE tp1 PARTITION OF temporal_partitioned FOR VALUES IN ('[1,1]', '[2,2]');
+CREATE TABLE tp2 PARTITION OF temporal_partitioned FOR VALUES IN ('[3,3]', '[4,4]');
+INSERT INTO temporal_partitioned VALUES
+  ('[1,1]', daterange('2000-01-01', '2000-02-01'), 'one'),
+  ('[1,1]', daterange('2000-02-01', '2000-03-01'), 'one'),
+  ('[3,3]', daterange('2000-01-01', '2010-01-01'), 'three');
+SELECT * FROM temporal_partitioned ORDER BY id, valid_at;
+SELECT * FROM tp1 ORDER BY id, valid_at;
+SELECT * FROM tp2 ORDER BY id, valid_at;
+DROP TABLE temporal_partitioned;
-- 
2.42.0