Indexes with INCLUDE columns and their support in B-tree

This patch introduces INCLUDE clause to index definition.  This clause
specifies a list of columns which will be included as a non-key part in
the index.  The INCLUDE columns exist solely to allow more queries to
benefit from index-only scans.  Also, such columns don't need to have
appropriate operator classes.  Expressions are not supported as INCLUDE
columns since they cannot be used in index-only scans.

Index access methods supporting INCLUDE are indicated by amcaninclude flag
in IndexAmRoutine.  For now, only B-tree indexes support INCLUDE clause.

In B-tree indexes INCLUDE columns are truncated from pivot index tuples
(tuples located in non-leaf pages and high keys).  Therefore, B-tree indexes
now might have variable number of attributes.  This patch also provides
generic facility to support that: pivot tuples contain number of their
attributes in t_tid.ip_posid.  Free 13th bit of t_info is used for indicating
that.  This facility will simplify further support of index suffix truncation.
The changes of above are backward-compatible, pg_upgrade doesn't need special
handling of B-tree indexes for that.

Bump catalog version

Author: Anastasia Lubennikova with contribition by Alexander Korotkov and me
Reviewed by: Peter Geoghegan, Tomas Vondra, Antonin Houska, Jeff Janes,
			 David Rowley, Alexander Korotkov
Discussion: https://www.postgresql.org/message-id/flat/56168952.4010101@postgrespro.ru

1 files changed, 3 insertions, 3 deletions

diff --git a/src/backend/commands/matview.c b/src/backend/commands/matview.c
index 410d4e5a380..e1eb7c374b8 100644
--- a/src/backend/commands/matview.c
+++ b/src/backend/commands/matview.c
@@ -602,7 +602,7 @@ refresh_by_match_merge(Oid matviewOid, Oid tempOid, Oid relowner,
 										  RelationGetRelationName(tempRel));
 	diffname = make_temptable_name_n(tempname, 2);
 
-	relnatts = matviewRel->rd_rel->relnatts;
+	relnatts = RelationGetNumberOfAttributes(matviewRel);
 
 	/* Open SPI context. */
 	if (SPI_connect() != SPI_OK_CONNECT)
@@ -680,7 +680,7 @@ refresh_by_match_merge(Oid matviewOid, Oid tempOid, Oid relowner,
 		if (is_usable_unique_index(indexRel))
 		{
 			Form_pg_index indexStruct = indexRel->rd_index;
-			int			numatts = indexStruct->indnatts;
+			int			indnkeyatts = indexStruct->indnkeyatts;
 			oidvector  *indclass;
 			Datum		indclassDatum;
 			bool		isnull;
@@ -695,7 +695,7 @@ refresh_by_match_merge(Oid matviewOid, Oid tempOid, Oid relowner,
 			indclass = (oidvector *) DatumGetPointer(indclassDatum);
 
 			/* Add quals for all columns from this index. */
-			for (i = 0; i < numatts; i++)
+			for (i = 0; i < indnkeyatts; i++)
 			{
 				int			attnum = indexStruct->indkey.values[i];
 				Oid			opclass = indclass->values[i];