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CREATE INDEX ... INCLUDING (column[, ...])

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Now indexes (but only B-tree for now) can contain "extra" column(s) which
doesn't participate in index structure, they are just stored in leaf
tuples. It allows to use index only scan by using single index instead
of two or more indexes.

Author: Anastasia Lubennikova with minor editorializing by me
Reviewers: David Rowley, Peter Geoghegan, Jeff Janes
This commit is contained in:
Teodor Sigaev
2016-04-08 19:31:49 +03:00
parent 339025c68f
commit 386e3d7609
68 changed files with 1321 additions and 256 deletions
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25
src/backend/access/nbtree/nbtutils.c
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@ -63,17 +63,26 @@ _bt_mkscankey(Relation rel, IndexTuple itup)
{
ScanKey skey;
TupleDesc itupdesc;
int natts;
int indnatts,
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;