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| author | Heikki Linnakangas <heikki.linnakangas@iki.fi> | 2015-03-26 19:12:00 +0200 |
|---|---|---|
| committer | Heikki Linnakangas <heikki.linnakangas@iki.fi> | 2015-03-26 19:12:00 +0200 |
| commit | d04c8ed9044eccebce043143a930617e3998c005 (patch) | |
| tree | e0167be995bb28dab91dfb92f1e18609e91a0d3e /src/include/access/gist.h | |
| parent | 8fa393a6d739796d9f06a7fba91d7e1d0c354879 (diff) | |
| download | postgresql-d04c8ed9044eccebce043143a930617e3998c005.tar.gz postgresql-d04c8ed9044eccebce043143a930617e3998c005.zip | |
Add support for index-only scans in GiST.
This adds a new GiST opclass method, 'fetch', which is used to reconstruct
the original Datum from the value stored in the index. Also, the 'canreturn'
index AM interface function gains a new 'attno' argument. That makes it
possible to use index-only scans on a multi-column index where some of the
opclasses support index-only scans but some do not.
This patch adds support in the box and point opclasses. Other opclasses
can added later as follow-on patches (btree_gist would be particularly
interesting).
Anastasia Lubennikova, with additional fixes and modifications by me.
Diffstat (limited to 'src/include/access/gist.h')
| -rw-r--r-- | src/include/access/gist.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/include/access/gist.h b/src/include/access/gist.h index 01f0a70feee..50261b8bdd5 100644 --- a/src/include/access/gist.h +++ b/src/include/access/gist.h @@ -33,7 +33,8 @@ #define GIST_PICKSPLIT_PROC 6 #define GIST_EQUAL_PROC 7 #define GIST_DISTANCE_PROC 8 -#define GISTNProcs 8 +#define GIST_FETCH_PROC 9 +#define GISTNProcs 9 /* * strategy numbers for GiST opclasses that want to implement the old |