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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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6
src/backend/commands/matview.c
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@ -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];