diff --git a/src/backend/access/nbtree/README b/src/backend/access/nbtree/README
index a3f11da..cf92ddb 100644
--- a/src/backend/access/nbtree/README
+++ b/src/backend/access/nbtree/README
@@ -676,3 +676,15 @@ Also, index searches using a key of a different datatype require comparisons
 to behave sanely across two datatypes.  The extensions to three or more
 datatypes within a family are not strictly required by the btree index
 mechanism itself, but the planner relies on them for optimization purposes.
+
+Included attributes in B-tree indexes
+-------------------------------------
+
+Since 10.0 there is an optional INCLUDE clause, that allows to add
+a portion of non-key attributes to index. They exist to allow more queries
+to benefit from index-only scans. We never use included attributes in
+ScanKeys, neither for search nor for inserts. That allows us to include
+into B-tree any datatypes, even those which don't have suitable opclass.
+Included columns only stored in regular items on leaf pages. All inner
+keys and high keys are truncated and contain only key attributes.
+That helps to reduce the size of index.
diff --git a/src/backend/access/nbtree/nbtinsert.c b/src/backend/access/nbtree/nbtinsert.c
index 6dca810..6278696 100644
--- a/src/backend/access/nbtree/nbtinsert.c
+++ b/src/backend/access/nbtree/nbtinsert.c
@@ -79,8 +79,6 @@ static OffsetNumber _bt_findsplitloc(Relation rel, Page page,
 static void _bt_checksplitloc(FindSplitData *state,
 				  OffsetNumber firstoldonright, bool newitemonleft,
 				  int dataitemstoleft, Size firstoldonrightsz);
-static bool _bt_pgaddtup(Page page, Size itemsize, IndexTuple itup,
-			 OffsetNumber itup_off);
 static bool _bt_isequal(TupleDesc itupdesc, Page page, OffsetNumber offnum,
 			int keysz, ScanKey scankey);
 static void _bt_vacuum_one_page(Relation rel, Buffer buffer, Relation heapRel);
@@ -109,18 +107,22 @@ _bt_doinsert(Relation rel, IndexTuple itup,
 			 IndexUniqueCheck checkUnique, Relation heapRel)
 {
 	bool		is_unique = false;
-	int			natts = rel->rd_rel->relnatts;
+	int			indnkeyatts;
 	ScanKey		itup_scankey;
 	BTStack		stack;
 	Buffer		buf;
 	OffsetNumber offset;
 
+	Assert(IndexRelationGetNumberOfAttributes(rel) != 0);
+	indnkeyatts = IndexRelationGetNumberOfKeyAttributes(rel);
+	Assert(indnkeyatts != 0);
+
 	/* we need an insertion scan key to do our search, so build one */
 	itup_scankey = _bt_mkscankey(rel, itup);
 
 top:
 	/* find the first page containing this key */
-	stack = _bt_search(rel, natts, itup_scankey, false, &buf, BT_WRITE, NULL);
+	stack = _bt_search(rel, indnkeyatts, itup_scankey, false, &buf, BT_WRITE, NULL);
 
 	offset = InvalidOffsetNumber;
 
@@ -135,7 +137,7 @@ top:
 	 * move right in the tree.  See Lehman and Yao for an excruciatingly
 	 * precise description.
 	 */
-	buf = _bt_moveright(rel, buf, natts, itup_scankey, false,
+	buf = _bt_moveright(rel, buf, indnkeyatts, itup_scankey, false,
 						true, stack, BT_WRITE, NULL);
 
 	/*
@@ -164,7 +166,7 @@ top:
 		TransactionId xwait;
 		uint32		speculativeToken;
 
-		offset = _bt_binsrch(rel, buf, natts, itup_scankey, false);
+		offset = _bt_binsrch(rel, buf, indnkeyatts, itup_scankey, false);
 		xwait = _bt_check_unique(rel, itup, heapRel, buf, offset, itup_scankey,
 								 checkUnique, &is_unique, &speculativeToken);
 
@@ -200,7 +202,7 @@ top:
 		 */
 		CheckForSerializableConflictIn(rel, NULL, buf);
 		/* do the insertion */
-		_bt_findinsertloc(rel, &buf, &offset, natts, itup_scankey, itup,
+		_bt_findinsertloc(rel, &buf, &offset, indnkeyatts, itup_scankey, itup,
 						  stack, heapRel);
 		_bt_insertonpg(rel, buf, InvalidBuffer, stack, itup, offset, false);
 	}
@@ -243,7 +245,7 @@ _bt_check_unique(Relation rel, IndexTuple itup, Relation heapRel,
 				 uint32 *speculativeToken)
 {
 	TupleDesc	itupdesc = RelationGetDescr(rel);
-	int			natts = rel->rd_rel->relnatts;
+	int			indnkeyatts = IndexRelationGetNumberOfKeyAttributes(rel);
 	SnapshotData SnapshotDirty;
 	OffsetNumber maxoff;
 	Page		page;
@@ -302,7 +304,7 @@ _bt_check_unique(Relation rel, IndexTuple itup, Relation heapRel,
 				 * in real comparison, but only for ordering/finding items on
 				 * pages. - vadim 03/24/97
 				 */
-				if (!_bt_isequal(itupdesc, page, offset, natts, itup_scankey))
+				if (!_bt_isequal(itupdesc, page, offset, indnkeyatts, itup_scankey))
 					break;		/* we're past all the equal tuples */
 
 				/* okay, we gotta fetch the heap tuple ... */
@@ -467,7 +469,7 @@ _bt_check_unique(Relation rel, IndexTuple itup, Relation heapRel,
 			if (P_RIGHTMOST(opaque))
 				break;
 			if (!_bt_isequal(itupdesc, page, P_HIKEY,
-							 natts, itup_scankey))
+							 indnkeyatts, itup_scankey))
 				break;
 			/* Advance to next non-dead page --- there must be one */
 			for (;;)
@@ -982,6 +984,9 @@ _bt_split(Relation rel, Buffer buf, Buffer cbuf, OffsetNumber firstright,
 	OffsetNumber i;
 	bool		isroot;
 	bool		isleaf;
+	IndexTuple lefthikey;
+	int indnatts = IndexRelationGetNumberOfAttributes(rel);
+	int indnkeyatts = IndexRelationGetNumberOfKeyAttributes(rel);
 
 	/* Acquire a new page to split into */
 	rbuf = _bt_getbuf(rel, P_NEW, BT_WRITE);
@@ -1082,7 +1087,22 @@ _bt_split(Relation rel, Buffer buf, Buffer cbuf, OffsetNumber firstright,
 		itemsz = ItemIdGetLength(itemid);
 		item = (IndexTuple) PageGetItem(origpage, itemid);
 	}
-	if (PageAddItem(leftpage, (Item) item, itemsz, leftoff,
+
+	/*
+	 * We must truncate the "high key" item, before insert it onto the leaf page.
+	 * It's the only point in insertion process, where we perform truncation.
+	 * All other functions work with this high key and do not change it.
+	 */
+	if (indnatts != indnkeyatts && P_ISLEAF(lopaque))
+	{
+		lefthikey = index_truncate_tuple(rel, item);
+		itemsz = IndexTupleSize(lefthikey);
+		itemsz = MAXALIGN(itemsz);
+	}
+	else
+		lefthikey = item;
+
+	if (PageAddItem(leftpage, (Item) lefthikey, itemsz, leftoff,
 					false, false) == InvalidOffsetNumber)
 	{
 		memset(rightpage, 0, BufferGetPageSize(rbuf));
@@ -2089,7 +2109,7 @@ _bt_newroot(Relation rel, Buffer lbuf, Buffer rbuf)
  *		we insert the tuples in order, so that the given itup_off does
  *		represent the final position of the tuple!
  */
-static bool
+bool
 _bt_pgaddtup(Page page,
 			 Size itemsize,
 			 IndexTuple itup,
diff --git a/src/backend/access/nbtree/nbtpage.c b/src/backend/access/nbtree/nbtpage.c
index f815fd4..9ab7603 100644
--- a/src/backend/access/nbtree/nbtpage.c
+++ b/src/backend/access/nbtree/nbtpage.c
@@ -1255,8 +1255,9 @@ _bt_pagedel(Relation rel, Buffer buf)
 				/* we need an insertion scan key for the search, so build one */
 				itup_scankey = _bt_mkscankey(rel, targetkey);
 				/* find the leftmost leaf page containing this key */
-				stack = _bt_search(rel, rel->rd_rel->relnatts, itup_scankey,
-								   false, &lbuf, BT_READ, NULL);
+				stack = _bt_search(rel,
+								   IndexRelationGetNumberOfKeyAttributes(rel),
+								   itup_scankey, false, &lbuf, BT_READ, NULL);
 				/* don't need a pin on the page */
 				_bt_relbuf(rel, lbuf);
 
diff --git a/src/backend/access/nbtree/nbtree.c b/src/backend/access/nbtree/nbtree.c
index 643c025..081f13d 100644
--- a/src/backend/access/nbtree/nbtree.c
+++ b/src/backend/access/nbtree/nbtree.c
@@ -141,7 +141,7 @@ bthandler(PG_FUNCTION_ARGS)
 	amroutine->amclusterable = true;
 	amroutine->ampredlocks = true;
 	amroutine->amcanparallel = true;
-	amroutine->amcaninclude = false;
+	amroutine->amcaninclude = true;
 	amroutine->amkeytype = InvalidOid;
 
 	amroutine->ambuild = btbuild;
diff --git a/src/backend/access/nbtree/nbtsort.c b/src/backend/access/nbtree/nbtsort.c
index 3d041c4..e1a61b6 100644
--- a/src/backend/access/nbtree/nbtsort.c
+++ b/src/backend/access/nbtree/nbtsort.c
@@ -456,6 +456,9 @@ _bt_buildadd(BTWriteState *wstate, BTPageState *state, IndexTuple itup)
 	OffsetNumber last_off;
 	Size		pgspc;
 	Size		itupsz;
+	BTPageOpaque pageop;
+	int indnatts = IndexRelationGetNumberOfAttributes(wstate->index);
+	int indnkeyatts = IndexRelationGetNumberOfKeyAttributes(wstate->index);
 
 	/*
 	 * This is a handy place to check for cancel interrupts during the btree
@@ -510,6 +513,8 @@ _bt_buildadd(BTWriteState *wstate, BTPageState *state, IndexTuple itup)
 		ItemId		ii;
 		ItemId		hii;
 		IndexTuple	oitup;
+		IndexTuple	keytup;
+		BTPageOpaque opageop = (BTPageOpaque) PageGetSpecialPointer(opage);
 
 		/* Create new page of same level */
 		npage = _bt_blnewpage(state->btps_level);
@@ -537,6 +542,28 @@ _bt_buildadd(BTWriteState *wstate, BTPageState *state, IndexTuple itup)
 		ItemIdSetUnused(ii);	/* redundant */
 		((PageHeader) opage)->pd_lower -= sizeof(ItemIdData);
 
+		if (indnkeyatts != indnatts && P_ISLEAF(opageop))
+		{
+			/*
+			 * It's essential to truncate High key here.
+			 * The purpose is not just to save more space on this particular page,
+			 * but to keep whole b-tree structure consistent. Subsequent insertions
+			 * assume that hikey is already truncated, and so they should not
+			 * worry about it, when copying the high key into the parent page
+			 * as a downlink.
+			 * NOTE It is not crutial for reliability in present,
+			 * but maybe it will be that in the future.
+			 */
+			keytup = index_truncate_tuple(wstate->index, oitup);
+
+			/*  delete "wrong" high key, insert keytup as P_HIKEY. */
+			PageIndexTupleDelete(opage, P_HIKEY);
+
+			if (!_bt_pgaddtup(opage, IndexTupleSize(keytup), keytup, P_HIKEY))
+				elog(ERROR, "failed to rewrite compressed item in index \"%s\"",
+					RelationGetRelationName(wstate->index));
+		}
+
 		/*
 		 * Link the old page into its parent, using its minimum key. If we
 		 * don't have a parent, we have to create one; this adds a new btree
@@ -554,7 +581,11 @@ _bt_buildadd(BTWriteState *wstate, BTPageState *state, IndexTuple itup)
 		 * Save a copy of the minimum key for the new page.  We have to copy
 		 * it off the old page, not the new one, in case we are not at leaf
 		 * level.
+		 * Despite oitup is already initialized, it's important to get high
+		 * key from the page, since we could have replaced it with truncated
+		 * copy. See comment above.
 		 */
+		oitup = (IndexTuple) PageGetItem(opage,PageGetItemId(opage, P_HIKEY));
 		state->btps_minkey = CopyIndexTuple(oitup);
 
 		/*
@@ -581,6 +612,7 @@ _bt_buildadd(BTWriteState *wstate, BTPageState *state, IndexTuple itup)
 		last_off = P_FIRSTKEY;
 	}
 
+	pageop = (BTPageOpaque) PageGetSpecialPointer(npage);
 	/*
 	 * If the new item is the first for its page, stash a copy for later. Note
 	 * this will only happen for the first item on a level; on later pages,
@@ -590,7 +622,14 @@ _bt_buildadd(BTWriteState *wstate, BTPageState *state, IndexTuple itup)
 	if (last_off == P_HIKEY)
 	{
 		Assert(state->btps_minkey == NULL);
-		state->btps_minkey = CopyIndexTuple(itup);
+		/*
+		 * Truncate the tuple that we're going to insert
+		 * into the parent page as a downlink
+		 */
+		if (indnkeyatts != indnatts && P_ISLEAF(pageop))
+			state->btps_minkey = index_truncate_tuple(wstate->index, itup);
+		else
+			state->btps_minkey = CopyIndexTuple(itup);
 	}
 
 	/*
@@ -683,7 +722,7 @@ _bt_load(BTWriteState *wstate, BTSpool *btspool, BTSpool *btspool2)
 	bool		load1;
 	TupleDesc	tupdes = RelationGetDescr(wstate->index);
 	int			i,
-				keysz = RelationGetNumberOfAttributes(wstate->index);
+				keysz = IndexRelationGetNumberOfKeyAttributes(wstate->index);
 	ScanKey		indexScanKey = NULL;
 	SortSupport sortKeys;
 
diff --git a/src/backend/access/nbtree/nbtutils.c b/src/backend/access/nbtree/nbtutils.c
index 5b259a3..51001f8 100644
--- a/src/backend/access/nbtree/nbtutils.c
+++ b/src/backend/access/nbtree/nbtutils.c
@@ -63,17 +63,26 @@ _bt_mkscankey(Relation rel, IndexTuple itup)
 {
 	ScanKey		skey;
 	TupleDesc	itupdesc;
-	int			natts;
+	int     	indnatts PG_USED_FOR_ASSERTS_ONLY;
+	int			indnkeyatts;
 	int16	   *indoption;
 	int			i;
 
 	itupdesc = RelationGetDescr(rel);
-	natts = RelationGetNumberOfAttributes(rel);
+	indnatts = IndexRelationGetNumberOfAttributes(rel);
+	indnkeyatts = IndexRelationGetNumberOfKeyAttributes(rel);
 	indoption = rel->rd_indoption;
 
-	skey = (ScanKey) palloc(natts * sizeof(ScanKeyData));
+	Assert(indnkeyatts != 0);
+	Assert(indnkeyatts <= indnatts);
 
-	for (i = 0; i < natts; i++)
+	/*
+	 * We'll execute search using ScanKey constructed on key columns.
+	 * Non key (included) columns must be omitted.
+	 */
+	skey = (ScanKey) palloc(indnkeyatts * sizeof(ScanKeyData));
+
+	for (i = 0; i < indnkeyatts; i++)
 	{
 		FmgrInfo   *procinfo;
 		Datum		arg;
@@ -115,16 +124,16 @@ ScanKey
 _bt_mkscankey_nodata(Relation rel)
 {
 	ScanKey		skey;
-	int			natts;
+	int     	indnkeyatts;
 	int16	   *indoption;
 	int			i;
 
-	natts = RelationGetNumberOfAttributes(rel);
+	indnkeyatts = IndexRelationGetNumberOfKeyAttributes(rel);
 	indoption = rel->rd_indoption;
 
-	skey = (ScanKey) palloc(natts * sizeof(ScanKeyData));
+	skey = (ScanKey) palloc(indnkeyatts * sizeof(ScanKeyData));
 
-	for (i = 0; i < natts; i++)
+	for (i = 0; i < indnkeyatts; i++)
 	{
 		FmgrInfo   *procinfo;
 		int			flags;
diff --git a/src/include/access/nbtree.h b/src/include/access/nbtree.h
index f9304db..ff6295d 100644
--- a/src/include/access/nbtree.h
+++ b/src/include/access/nbtree.h
@@ -470,6 +470,8 @@ extern bool _bt_doinsert(Relation rel, IndexTuple itup,
 			 IndexUniqueCheck checkUnique, Relation heapRel);
 extern Buffer _bt_getstackbuf(Relation rel, BTStack stack, int access);
 extern void _bt_finish_split(Relation rel, Buffer bbuf, BTStack stack);
+extern bool _bt_pgaddtup(Page page, Size itemsize, IndexTuple itup,
+						 OffsetNumber itup_off);
 
 /*
  * prototypes for functions in nbtpage.c
diff --git a/src/test/regress/expected/create_index.out b/src/test/regress/expected/create_index.out
index 26cd059..2e1961d 100644
--- a/src/test/regress/expected/create_index.out
+++ b/src/test/regress/expected/create_index.out
@@ -2395,6 +2395,25 @@ DETAIL:  Key ((f1 || f2))=(ABCDEF) already exists.
 -- but this shouldn't:
 INSERT INTO func_index_heap VALUES('QWERTY');
 --
+-- Test unique index with included columns
+--
+CREATE TABLE covering_index_heap (f1 int, f2 int, f3 text);
+CREATE UNIQUE INDEX covering_index_index on covering_index_heap (f1,f2) INCLUDE(f3);
+INSERT INTO covering_index_heap VALUES(1,1,'AAA');
+INSERT INTO covering_index_heap VALUES(1,2,'AAA');
+-- this should fail because of unique index on f1,f2:
+INSERT INTO covering_index_heap VALUES(1,2,'BBB');
+ERROR:  duplicate key value violates unique constraint "covering_index_index"
+DETAIL:  Key (f1, f2)=(1, 2) already exists.
+-- and this shouldn't:
+INSERT INTO covering_index_heap VALUES(1,4,'AAA');
+-- Try to build index on table that already contains data
+CREATE UNIQUE INDEX covering_pkey on covering_index_heap (f1,f2) INCLUDE(f3);
+-- Try to use existing covering index as primary key
+ALTER TABLE covering_index_heap ADD CONSTRAINT covering_pkey PRIMARY KEY USING INDEX
+covering_pkey;
+DROP TABLE covering_index_heap;
+--
 -- Also try building functional, expressional, and partial indexes on
 -- tables that already contain data.
 --
diff --git a/src/test/regress/expected/index_including.out b/src/test/regress/expected/index_including.out
new file mode 100644
index 0000000..d14b3ee
--- /dev/null
+++ b/src/test/regress/expected/index_including.out
@@ -0,0 +1,320 @@
+/*
+ * 1.test CREATE INDEX
+ */
+ -- Regular index with included columns
+CREATE TABLE tbl (c1 int, c2 int, c3 int, c4 box);
+INSERT INTO tbl select x, 2*x, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+CREATE INDEX tbl_idx ON tbl using btree(c1, c2) INCLUDE (c3,c4);
+-- must fail because of intersection of key and included columns
+CREATE INDEX tbl_idx ON tbl using btree(c1, c2) INCLUDE (c1,c3);
+ERROR:  included columns must not intersect with key columns
+DROP TABLE tbl;
+-- Unique index and unique constraint
+CREATE TABLE tbl (c1 int, c2 int, c3 int, c4 box);
+INSERT INTO tbl select x, 2*x, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+CREATE UNIQUE INDEX tbl_idx_unique ON tbl using btree(c1, c2) INCLUDE (c3,c4);
+ALTER TABLE tbl add UNIQUE USING INDEX tbl_idx_unique;
+ALTER TABLE tbl add UNIQUE(c1, c2) INCLUDE (c3, c4);
+DROP TABLE tbl;
+-- Unique index and unique constraint. Both must fail.
+CREATE TABLE tbl (c1 int, c2 int, c3 int, c4 box);
+INSERT INTO tbl select 1, 2, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+CREATE UNIQUE INDEX tbl_idx_unique ON tbl using btree(c1, c2) INCLUDE (c3,c4);
+ERROR:  could not create unique index "tbl_idx_unique"
+DETAIL:  Key (c1, c2)=(1, 2) is duplicated.
+ALTER TABLE tbl add UNIQUE(c1, c2) INCLUDE (c3, c4);
+ERROR:  could not create unique index "tbl_c1_c2_c3_c4_key"
+DETAIL:  Key (c1, c2)=(1, 2) is duplicated.
+DROP TABLE tbl;
+-- PK constraint
+CREATE TABLE tbl (c1 int, c2 int, c3 int, c4 box);
+INSERT INTO tbl select 1, 2, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+ALTER TABLE tbl add PRIMARY KEY(c1, c2) INCLUDE (c3, c4);
+ERROR:  could not create unique index "tbl_pkey"
+DETAIL:  Key (c1, c2)=(1, 2) is duplicated.
+DROP TABLE tbl;
+CREATE TABLE tbl (c1 int, c2 int, c3 int, c4 box);
+INSERT INTO tbl select 1, 2, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+CREATE UNIQUE INDEX tbl_idx_unique ON tbl using btree(c1, c2) INCLUDE (c3,c4);
+ERROR:  could not create unique index "tbl_idx_unique"
+DETAIL:  Key (c1, c2)=(1, 2) is duplicated.
+ALTER TABLE tbl add PRIMARY KEY USING INDEX tbl_idx_unique;
+ERROR:  index "tbl_idx_unique" does not exist
+LINE 1: ALTER TABLE tbl add PRIMARY KEY USING INDEX tbl_idx_unique;
+                            ^
+DROP TABLE tbl;
+-- PK constraint. Must fail.
+CREATE TABLE tbl (c1 int, c2 int, c3 int, c4 box);
+INSERT INTO tbl select 1, 2, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+ALTER TABLE tbl add PRIMARY KEY(c1, c2) INCLUDE (c3, c4);
+ERROR:  could not create unique index "tbl_pkey"
+DETAIL:  Key (c1, c2)=(1, 2) is duplicated.
+DROP TABLE tbl;
+/*
+ * 2. Test CREATE TABLE with constraint
+ */
+CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 box,
+				CONSTRAINT covering UNIQUE(c1,c2) INCLUDE(c3,c4));
+select indexrelid::regclass, indnatts, indnkeyatts, indisunique, indisprimary, indkey, indclass from pg_index where indrelid = 'tbl'::regclass::oid;
+ indexrelid | indnatts | indnkeyatts | indisunique | indisprimary | indkey  | indclass  
+------------+----------+-------------+-------------+--------------+---------+-----------
+ covering   |        4 |           2 | t           | f            | 1 2 3 4 | 1978 1978
+(1 row)
+
+select pg_get_constraintdef(oid), conname, conkey, conincluding from pg_constraint where conrelid = 'tbl'::regclass::oid;
+       pg_get_constraintdef       | conname  | conkey | conincluding 
+----------------------------------+----------+--------+--------------
+ UNIQUE (c1, c2) INCLUDE (c3, c4) | covering | {1,2}  | {3,4}
+(1 row)
+
+-- ensure that constraint works
+INSERT INTO tbl select 1, 2, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+ERROR:  duplicate key value violates unique constraint "covering"
+DETAIL:  Key (c1, c2)=(1, 2) already exists.
+DROP TABLE tbl;
+CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 box,
+				CONSTRAINT covering PRIMARY KEY(c1,c2) INCLUDE(c3,c4));
+select indexrelid::regclass, indnatts, indnkeyatts, indisunique, indisprimary, indkey, indclass from pg_index where indrelid = 'tbl'::regclass::oid;
+ indexrelid | indnatts | indnkeyatts | indisunique | indisprimary | indkey  | indclass  
+------------+----------+-------------+-------------+--------------+---------+-----------
+ covering   |        4 |           2 | t           | t            | 1 2 3 4 | 1978 1978
+(1 row)
+
+select pg_get_constraintdef(oid), conname, conkey, conincluding from pg_constraint where conrelid = 'tbl'::regclass::oid;
+         pg_get_constraintdef          | conname  | conkey | conincluding 
+---------------------------------------+----------+--------+--------------
+ PRIMARY KEY (c1, c2) INCLUDE (c3, c4) | covering | {1,2}  | {3,4}
+(1 row)
+
+-- ensure that constraint works
+INSERT INTO tbl select 1, 2, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+ERROR:  duplicate key value violates unique constraint "covering"
+DETAIL:  Key (c1, c2)=(1, 2) already exists.
+INSERT INTO tbl select 1, NULL, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+ERROR:  null value in column "c2" violates not-null constraint
+DETAIL:  Failing row contains (1, null, 3, (4,4),(4,4)).
+INSERT INTO tbl select x, 2*x, NULL, NULL from generate_series(1,10) as x;
+DROP TABLE tbl;
+CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 box,
+				UNIQUE(c1,c2) INCLUDE(c3,c4));
+select indexrelid::regclass, indnatts, indnkeyatts, indisunique, indisprimary, indkey, indclass from pg_index where indrelid = 'tbl'::regclass::oid;
+     indexrelid      | indnatts | indnkeyatts | indisunique | indisprimary | indkey  | indclass  
+---------------------+----------+-------------+-------------+--------------+---------+-----------
+ tbl_c1_c2_c3_c4_key |        4 |           2 | t           | f            | 1 2 3 4 | 1978 1978
+(1 row)
+
+select pg_get_constraintdef(oid), conname, conkey, conincluding from pg_constraint where conrelid = 'tbl'::regclass::oid;
+       pg_get_constraintdef       |       conname       | conkey | conincluding 
+----------------------------------+---------------------+--------+--------------
+ UNIQUE (c1, c2) INCLUDE (c3, c4) | tbl_c1_c2_c3_c4_key | {1,2}  | {3,4}
+(1 row)
+
+-- ensure that constraint works
+INSERT INTO tbl select 1, 2, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+ERROR:  duplicate key value violates unique constraint "tbl_c1_c2_c3_c4_key"
+DETAIL:  Key (c1, c2)=(1, 2) already exists.
+DROP TABLE tbl;
+CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 box,
+				PRIMARY KEY(c1,c2) INCLUDE(c3,c4));
+select indexrelid::regclass, indnatts, indnkeyatts, indisunique, indisprimary, indkey, indclass from pg_index where indrelid = 'tbl'::regclass::oid;
+ indexrelid | indnatts | indnkeyatts | indisunique | indisprimary | indkey  | indclass  
+------------+----------+-------------+-------------+--------------+---------+-----------
+ tbl_pkey   |        4 |           2 | t           | t            | 1 2 3 4 | 1978 1978
+(1 row)
+
+select pg_get_constraintdef(oid), conname, conkey, conincluding from pg_constraint where conrelid = 'tbl'::regclass::oid;
+         pg_get_constraintdef          | conname  | conkey | conincluding 
+---------------------------------------+----------+--------+--------------
+ PRIMARY KEY (c1, c2) INCLUDE (c3, c4) | tbl_pkey | {1,2}  | {3,4}
+(1 row)
+
+-- ensure that constraint works
+INSERT INTO tbl select 1, 2, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+ERROR:  duplicate key value violates unique constraint "tbl_pkey"
+DETAIL:  Key (c1, c2)=(1, 2) already exists.
+INSERT INTO tbl select 1, NULL, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+ERROR:  null value in column "c2" violates not-null constraint
+DETAIL:  Failing row contains (1, null, 3, (4,4),(4,4)).
+INSERT INTO tbl select x, 2*x, NULL, NULL from generate_series(1,10) as x;
+DROP TABLE tbl;
+CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 box,
+				EXCLUDE USING btree (c1 WITH =) INCLUDE(c3,c4));
+select indexrelid::regclass, indnatts, indnkeyatts, indisunique, indisprimary, indkey, indclass from pg_index where indrelid = 'tbl'::regclass::oid;
+    indexrelid     | indnatts | indnkeyatts | indisunique | indisprimary | indkey | indclass 
+-------------------+----------+-------------+-------------+--------------+--------+----------
+ tbl_c1_c3_c4_excl |        3 |           1 | f           | f            | 1 3 4  | 1978
+(1 row)
+
+select pg_get_constraintdef(oid), conname, conkey, conincluding from pg_constraint where conrelid = 'tbl'::regclass::oid;
+               pg_get_constraintdef               |      conname      | conkey | conincluding 
+--------------------------------------------------+-------------------+--------+--------------
+ EXCLUDE USING btree (c1 WITH =) INCLUDE (c3, c4) | tbl_c1_c3_c4_excl | {1}    | {3,4}
+(1 row)
+
+-- ensure that constraint works
+INSERT INTO tbl select 1, 2, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+ERROR:  conflicting key value violates exclusion constraint "tbl_c1_c3_c4_excl"
+DETAIL:  Key (c1)=(1) conflicts with existing key (c1)=(1).
+INSERT INTO tbl select x, 2*x, NULL, NULL from generate_series(1,10) as x;
+DROP TABLE tbl;
+/*
+ * 3.0 Test ALTER TABLE DROP COLUMN.
+ * Any column deletion leads to index deletion.
+ */
+CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 int);
+CREATE UNIQUE INDEX tbl_idx ON tbl using btree(c1, c2, c3, c4);
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+                            indexdef                             
+-----------------------------------------------------------------
+ CREATE UNIQUE INDEX tbl_idx ON tbl USING btree (c1, c2, c3, c4)
+(1 row)
+
+ALTER TABLE tbl DROP COLUMN c3;
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+ indexdef 
+----------
+(0 rows)
+
+DROP TABLE tbl;
+/*
+ * 3.1 Test ALTER TABLE DROP COLUMN.
+ * Included column deletion leads to the index deletion,
+ * as well as key columns deletion. It's explained in documentation.
+ */
+CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 box);
+CREATE UNIQUE INDEX tbl_idx ON tbl using btree(c1, c2) INCLUDE(c3,c4);
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+                                 indexdef                                 
+--------------------------------------------------------------------------
+ CREATE UNIQUE INDEX tbl_idx ON tbl USING btree (c1, c2) INCLUDE (c3, c4)
+(1 row)
+
+ALTER TABLE tbl DROP COLUMN c3;
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+ indexdef 
+----------
+(0 rows)
+
+DROP TABLE tbl;
+/*
+ * 3.2 Test ALTER TABLE DROP COLUMN.
+ * Included column deletion leads to the index deletion.
+ * as well as key columns deletion. It's explained in documentation.
+ */
+CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 box, UNIQUE(c1, c2) INCLUDE(c3,c4));
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+                                       indexdef                                       
+--------------------------------------------------------------------------------------
+ CREATE UNIQUE INDEX tbl_c1_c2_c3_c4_key ON tbl USING btree (c1, c2) INCLUDE (c3, c4)
+(1 row)
+
+ALTER TABLE tbl DROP COLUMN c3;
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+ indexdef 
+----------
+(0 rows)
+
+ALTER TABLE tbl DROP COLUMN c1;
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+ indexdef 
+----------
+(0 rows)
+
+DROP TABLE tbl;
+/*
+ * 4. CREATE INDEX CONCURRENTLY
+ */
+CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 box, UNIQUE(c1, c2) INCLUDE(c3,c4));
+INSERT INTO tbl select x, 2*x, 3*x, box('4,4,4,4') from generate_series(1,1000) as x;
+CREATE UNIQUE INDEX CONCURRENTLY on tbl (c1, c2) INCLUDE (c3, c4);
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+                                       indexdef                                       
+--------------------------------------------------------------------------------------
+ CREATE UNIQUE INDEX tbl_c1_c2_c3_c4_idx ON tbl USING btree (c1, c2) INCLUDE (c3, c4)
+ CREATE UNIQUE INDEX tbl_c1_c2_c3_c4_key ON tbl USING btree (c1, c2) INCLUDE (c3, c4)
+(2 rows)
+
+DROP TABLE tbl;
+/*
+ * 5. REINDEX
+ */
+CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 box, UNIQUE(c1, c2) INCLUDE(c3,c4));
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+                                       indexdef                                       
+--------------------------------------------------------------------------------------
+ CREATE UNIQUE INDEX tbl_c1_c2_c3_c4_key ON tbl USING btree (c1, c2) INCLUDE (c3, c4)
+(1 row)
+
+ALTER TABLE tbl DROP COLUMN c3;
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+ indexdef 
+----------
+(0 rows)
+
+REINDEX INDEX tbl_c1_c2_c3_c4_key;
+ERROR:  relation "tbl_c1_c2_c3_c4_key" does not exist
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+ indexdef 
+----------
+(0 rows)
+
+ALTER TABLE tbl DROP COLUMN c1;
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+ indexdef 
+----------
+(0 rows)
+
+DROP TABLE tbl;
+/*
+ * 7. Check various AMs. All but brtee must fail.
+ */
+CREATE TABLE tbl (c1 int,c2 int, c3 box, c4 box);
+CREATE INDEX on tbl USING brin(c1, c2) INCLUDE (c3, c4);
+ERROR:  access method "brin" does not support included columns
+CREATE INDEX on tbl USING gist(c3) INCLUDE (c4);
+ERROR:  access method "gist" does not support included columns
+CREATE INDEX on tbl USING spgist(c3) INCLUDE (c4);
+ERROR:  access method "spgist" does not support included columns
+CREATE INDEX on tbl USING gin(c1, c2) INCLUDE (c3, c4);
+ERROR:  access method "gin" does not support included columns
+CREATE INDEX on tbl USING hash(c1, c2) INCLUDE (c3, c4);
+ERROR:  access method "hash" does not support included columns
+CREATE INDEX on tbl USING rtree(c1, c2) INCLUDE (c3, c4);
+NOTICE:  substituting access method "gist" for obsolete method "rtree"
+ERROR:  access method "gist" does not support included columns
+CREATE INDEX on tbl USING btree(c1, c2) INCLUDE (c3, c4);
+DROP TABLE tbl;
+/*
+ * 8. Update, delete values in indexed table.
+ */
+CREATE TABLE tbl (c1 int, c2 int, c3 int, c4 box);
+INSERT INTO tbl select x, 2*x, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+CREATE UNIQUE INDEX tbl_idx_unique ON tbl using btree(c1, c2) INCLUDE (c3,c4);
+UPDATE tbl SET c1 = 100 WHERE c1 = 2;
+UPDATE tbl SET c1 = 1 WHERE c1 = 3;
+-- should fail
+UPDATE tbl SET c2 = 2 WHERE c1 = 1;
+ERROR:  duplicate key value violates unique constraint "tbl_idx_unique"
+DETAIL:  Key (c1, c2)=(1, 2) already exists.
+UPDATE tbl SET c3 = 1;
+DELETE FROM tbl WHERE c1 = 5 OR c3 = 12;
+DROP TABLE tbl;
+/*
+ * 9. Alter column type.
+ */
+CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 box, UNIQUE(c1, c2) INCLUDE(c3,c4));
+INSERT INTO tbl select x, 2*x, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+ALTER TABLE tbl ALTER c1 TYPE bigint;
+ALTER TABLE tbl ALTER c3 TYPE bigint;
+\d tbl
+                Table "public.tbl"
+ Column |  Type   | Collation | Nullable | Default 
+--------+---------+-----------+----------+---------
+ c1     | bigint  |           |          | 
+ c2     | integer |           |          | 
+ c3     | bigint  |           |          | 
+ c4     | box     |           |          | 
+Indexes:
+    "tbl_c1_c2_c3_c4_key" UNIQUE CONSTRAINT, btree (c1, c2) INCLUDE (c3, c4)
+
+DROP TABLE tbl;
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index 9f95b01..23cb30e 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -55,7 +55,7 @@ test: copy copyselect copydml
 # ----------
 test: create_misc create_operator
 # These depend on the above two
-test: create_index create_view
+test: create_index create_view index_including
 
 # ----------
 # Another group of parallel tests
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index e026b7c..5eda474 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -63,6 +63,7 @@ test: copydml
 test: create_misc
 test: create_operator
 test: create_index
+test: index_including
 test: create_view
 test: create_aggregate
 test: create_function_3
diff --git a/src/test/regress/sql/create_index.sql b/src/test/regress/sql/create_index.sql
index 1648072..d30a52b 100644
--- a/src/test/regress/sql/create_index.sql
+++ b/src/test/regress/sql/create_index.sql
@@ -732,6 +732,26 @@ INSERT INTO func_index_heap VALUES('ABCD', 'EF');
 INSERT INTO func_index_heap VALUES('QWERTY');
 
 --
+-- Test unique index with included columns
+--
+CREATE TABLE covering_index_heap (f1 int, f2 int, f3 text);
+CREATE UNIQUE INDEX covering_index_index on covering_index_heap (f1,f2) INCLUDE(f3);
+
+INSERT INTO covering_index_heap VALUES(1,1,'AAA');
+INSERT INTO covering_index_heap VALUES(1,2,'AAA');
+-- this should fail because of unique index on f1,f2:
+INSERT INTO covering_index_heap VALUES(1,2,'BBB');
+-- and this shouldn't:
+INSERT INTO covering_index_heap VALUES(1,4,'AAA');
+-- Try to build index on table that already contains data
+CREATE UNIQUE INDEX covering_pkey on covering_index_heap (f1,f2) INCLUDE(f3);
+-- Try to use existing covering index as primary key
+ALTER TABLE covering_index_heap ADD CONSTRAINT covering_pkey PRIMARY KEY USING INDEX
+covering_pkey;
+DROP TABLE covering_index_heap;
+
+
+--
 -- Also try building functional, expressional, and partial indexes on
 -- tables that already contain data.
 --
diff --git a/src/test/regress/sql/index_including.sql b/src/test/regress/sql/index_including.sql
new file mode 100644
index 0000000..e0a700b
--- /dev/null
+++ b/src/test/regress/sql/index_including.sql
@@ -0,0 +1,189 @@
+/*
+ * 1.test CREATE INDEX
+ */
+ -- Regular index with included columns
+CREATE TABLE tbl (c1 int, c2 int, c3 int, c4 box);
+INSERT INTO tbl select x, 2*x, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+CREATE INDEX tbl_idx ON tbl using btree(c1, c2) INCLUDE (c3,c4);
+-- must fail because of intersection of key and included columns
+CREATE INDEX tbl_idx ON tbl using btree(c1, c2) INCLUDE (c1,c3);
+DROP TABLE tbl;
+
+-- Unique index and unique constraint
+CREATE TABLE tbl (c1 int, c2 int, c3 int, c4 box);
+INSERT INTO tbl select x, 2*x, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+CREATE UNIQUE INDEX tbl_idx_unique ON tbl using btree(c1, c2) INCLUDE (c3,c4);
+ALTER TABLE tbl add UNIQUE USING INDEX tbl_idx_unique;
+ALTER TABLE tbl add UNIQUE(c1, c2) INCLUDE (c3, c4);
+DROP TABLE tbl;
+
+-- Unique index and unique constraint. Both must fail.
+CREATE TABLE tbl (c1 int, c2 int, c3 int, c4 box);
+INSERT INTO tbl select 1, 2, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+CREATE UNIQUE INDEX tbl_idx_unique ON tbl using btree(c1, c2) INCLUDE (c3,c4);
+ALTER TABLE tbl add UNIQUE(c1, c2) INCLUDE (c3, c4);
+DROP TABLE tbl;
+
+-- PK constraint
+CREATE TABLE tbl (c1 int, c2 int, c3 int, c4 box);
+INSERT INTO tbl select 1, 2, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+ALTER TABLE tbl add PRIMARY KEY(c1, c2) INCLUDE (c3, c4);
+DROP TABLE tbl;
+
+CREATE TABLE tbl (c1 int, c2 int, c3 int, c4 box);
+INSERT INTO tbl select 1, 2, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+CREATE UNIQUE INDEX tbl_idx_unique ON tbl using btree(c1, c2) INCLUDE (c3,c4);
+ALTER TABLE tbl add PRIMARY KEY USING INDEX tbl_idx_unique;
+DROP TABLE tbl;
+-- PK constraint. Must fail.
+CREATE TABLE tbl (c1 int, c2 int, c3 int, c4 box);
+INSERT INTO tbl select 1, 2, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+ALTER TABLE tbl add PRIMARY KEY(c1, c2) INCLUDE (c3, c4);
+DROP TABLE tbl;
+
+
+/*
+ * 2. Test CREATE TABLE with constraint
+ */
+CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 box,
+				CONSTRAINT covering UNIQUE(c1,c2) INCLUDE(c3,c4));
+select indexrelid::regclass, indnatts, indnkeyatts, indisunique, indisprimary, indkey, indclass from pg_index where indrelid = 'tbl'::regclass::oid;
+select pg_get_constraintdef(oid), conname, conkey, conincluding from pg_constraint where conrelid = 'tbl'::regclass::oid;
+-- ensure that constraint works
+INSERT INTO tbl select 1, 2, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+DROP TABLE tbl;
+
+CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 box,
+				CONSTRAINT covering PRIMARY KEY(c1,c2) INCLUDE(c3,c4));
+select indexrelid::regclass, indnatts, indnkeyatts, indisunique, indisprimary, indkey, indclass from pg_index where indrelid = 'tbl'::regclass::oid;
+select pg_get_constraintdef(oid), conname, conkey, conincluding from pg_constraint where conrelid = 'tbl'::regclass::oid;
+-- ensure that constraint works
+INSERT INTO tbl select 1, 2, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+INSERT INTO tbl select 1, NULL, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+INSERT INTO tbl select x, 2*x, NULL, NULL from generate_series(1,10) as x;
+DROP TABLE tbl;
+
+CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 box,
+				UNIQUE(c1,c2) INCLUDE(c3,c4));
+select indexrelid::regclass, indnatts, indnkeyatts, indisunique, indisprimary, indkey, indclass from pg_index where indrelid = 'tbl'::regclass::oid;
+select pg_get_constraintdef(oid), conname, conkey, conincluding from pg_constraint where conrelid = 'tbl'::regclass::oid;
+-- ensure that constraint works
+INSERT INTO tbl select 1, 2, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+DROP TABLE tbl;
+
+CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 box,
+				PRIMARY KEY(c1,c2) INCLUDE(c3,c4));
+select indexrelid::regclass, indnatts, indnkeyatts, indisunique, indisprimary, indkey, indclass from pg_index where indrelid = 'tbl'::regclass::oid;
+select pg_get_constraintdef(oid), conname, conkey, conincluding from pg_constraint where conrelid = 'tbl'::regclass::oid;
+-- ensure that constraint works
+INSERT INTO tbl select 1, 2, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+INSERT INTO tbl select 1, NULL, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+INSERT INTO tbl select x, 2*x, NULL, NULL from generate_series(1,10) as x;
+DROP TABLE tbl;
+
+CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 box,
+				EXCLUDE USING btree (c1 WITH =) INCLUDE(c3,c4));
+select indexrelid::regclass, indnatts, indnkeyatts, indisunique, indisprimary, indkey, indclass from pg_index where indrelid = 'tbl'::regclass::oid;
+select pg_get_constraintdef(oid), conname, conkey, conincluding from pg_constraint where conrelid = 'tbl'::regclass::oid;
+-- ensure that constraint works
+INSERT INTO tbl select 1, 2, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+INSERT INTO tbl select x, 2*x, NULL, NULL from generate_series(1,10) as x;
+DROP TABLE tbl;
+
+/*
+ * 3.0 Test ALTER TABLE DROP COLUMN.
+ * Any column deletion leads to index deletion.
+ */
+CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 int);
+CREATE UNIQUE INDEX tbl_idx ON tbl using btree(c1, c2, c3, c4);
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+ALTER TABLE tbl DROP COLUMN c3;
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+DROP TABLE tbl;
+
+/*
+ * 3.1 Test ALTER TABLE DROP COLUMN.
+ * Included column deletion leads to the index deletion,
+ * as well as key columns deletion. It's explained in documentation.
+ */
+CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 box);
+CREATE UNIQUE INDEX tbl_idx ON tbl using btree(c1, c2) INCLUDE(c3,c4);
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+ALTER TABLE tbl DROP COLUMN c3;
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+DROP TABLE tbl;
+
+/*
+ * 3.2 Test ALTER TABLE DROP COLUMN.
+ * Included column deletion leads to the index deletion.
+ * as well as key columns deletion. It's explained in documentation.
+ */
+CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 box, UNIQUE(c1, c2) INCLUDE(c3,c4));
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+ALTER TABLE tbl DROP COLUMN c3;
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+ALTER TABLE tbl DROP COLUMN c1;
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+DROP TABLE tbl;
+
+
+/*
+ * 4. CREATE INDEX CONCURRENTLY
+ */
+CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 box, UNIQUE(c1, c2) INCLUDE(c3,c4));
+INSERT INTO tbl select x, 2*x, 3*x, box('4,4,4,4') from generate_series(1,1000) as x;
+CREATE UNIQUE INDEX CONCURRENTLY on tbl (c1, c2) INCLUDE (c3, c4);
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+DROP TABLE tbl;
+
+
+/*
+ * 5. REINDEX
+ */
+CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 box, UNIQUE(c1, c2) INCLUDE(c3,c4));
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+ALTER TABLE tbl DROP COLUMN c3;
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+REINDEX INDEX tbl_c1_c2_c3_c4_key;
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+ALTER TABLE tbl DROP COLUMN c1;
+select indexdef from pg_indexes where tablename = 'tbl' order by indexname;
+DROP TABLE tbl;
+
+/*
+ * 7. Check various AMs. All but brtee must fail.
+ */
+CREATE TABLE tbl (c1 int,c2 int, c3 box, c4 box);
+CREATE INDEX on tbl USING brin(c1, c2) INCLUDE (c3, c4);
+CREATE INDEX on tbl USING gist(c3) INCLUDE (c4);
+CREATE INDEX on tbl USING spgist(c3) INCLUDE (c4);
+CREATE INDEX on tbl USING gin(c1, c2) INCLUDE (c3, c4);
+CREATE INDEX on tbl USING hash(c1, c2) INCLUDE (c3, c4);
+CREATE INDEX on tbl USING rtree(c1, c2) INCLUDE (c3, c4);
+CREATE INDEX on tbl USING btree(c1, c2) INCLUDE (c3, c4);
+DROP TABLE tbl;
+
+/*
+ * 8. Update, delete values in indexed table.
+ */
+CREATE TABLE tbl (c1 int, c2 int, c3 int, c4 box);
+INSERT INTO tbl select x, 2*x, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+CREATE UNIQUE INDEX tbl_idx_unique ON tbl using btree(c1, c2) INCLUDE (c3,c4);
+UPDATE tbl SET c1 = 100 WHERE c1 = 2;
+UPDATE tbl SET c1 = 1 WHERE c1 = 3;
+-- should fail
+UPDATE tbl SET c2 = 2 WHERE c1 = 1;
+UPDATE tbl SET c3 = 1;
+DELETE FROM tbl WHERE c1 = 5 OR c3 = 12;
+DROP TABLE tbl;
+
+/*
+ * 9. Alter column type.
+ */
+CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 box, UNIQUE(c1, c2) INCLUDE(c3,c4));
+INSERT INTO tbl select x, 2*x, 3*x, box('4,4,4,4') from generate_series(1,10) as x;
+ALTER TABLE tbl ALTER c1 TYPE bigint;
+ALTER TABLE tbl ALTER c3 TYPE bigint;
+\d tbl
+DROP TABLE tbl;
+