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Indexes with INCLUDE columns and their support in B-tree

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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
This commit is contained in:
Teodor Sigaev
2018-04-07 23:00:39 +03:00
parent 01bb85169a
commit 8224de4f42
89 changed files with 2112 additions and 467 deletions
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8
src/backend/access/rmgrdesc/nbtdesc.c
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@@ -35,6 +35,8 @@ btree_desc(StringInfo buf, XLogReaderState *record)
}
case XLOG_BTREE_SPLIT_L:
case XLOG_BTREE_SPLIT_R:
case XLOG_BTREE_SPLIT_L_HIGHKEY:
case XLOG_BTREE_SPLIT_R_HIGHKEY:
{
xl_btree_split *xlrec = (xl_btree_split *) rec;
@@ -119,6 +121,12 @@ btree_identify(uint8 info)
case XLOG_BTREE_SPLIT_R:
id = "SPLIT_R";
break;
case XLOG_BTREE_SPLIT_L_HIGHKEY:
id = "SPLIT_L_HIGHKEY";
break;
case XLOG_BTREE_SPLIT_R_HIGHKEY:
id = "SPLIT_R_HIGHKEY";
break;
case XLOG_BTREE_VACUUM:
id = "VACUUM";
break;