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Add support for index-only scans in GiST.

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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.
This commit is contained in:
Heikki Linnakangas
2015-03-26 19:12:00 +02:00
parent 8fa393a6d7
commit d04c8ed904
24 changed files with 575 additions and 73 deletions
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8
src/backend/access/gist/gist.c
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@ -1404,6 +1404,14 @@ initGISTstate(Relation index)
else
giststate->distanceFn[i].fn_oid = InvalidOid;
/* opclasses are not required to provide a Fetch method */
if (OidIsValid(index_getprocid(index, i + 1, GIST_FETCH_PROC)))
fmgr_info_copy(&(giststate->fetchFn[i]),
index_getprocinfo(index, i + 1, GIST_FETCH_PROC),
scanCxt);
else
giststate->fetchFn[i].fn_oid = InvalidOid;
/*
* If the index column has a specified collation, we should honor that
* while doing comparisons. However, we may have a collatable storage