postgresql/contrib/dblink
Teodor Sigaev 8224de4f42 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
2018-04-07 23:00:39 +03:00
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expected Indexes with INCLUDE columns and their support in B-tree 2018-04-07 23:00:39 +03:00
input
output
sql Indexes with INCLUDE columns and their support in B-tree 2018-04-07 23:00:39 +03:00
.gitignore
dblink--1.0--1.1.sql
dblink--1.1--1.2.sql
dblink--1.2.sql
dblink--unpackaged--1.0.sql
dblink.c Indexes with INCLUDE columns and their support in B-tree 2018-04-07 23:00:39 +03:00
dblink.control
Makefile Prevent accidental linking of system-supplied copies of libpq.so etc. 2018-04-03 16:26:05 -04:00
pg_service.conf