Re: pgsql: First steps towards index scans with heap

Tom,

does this means that 'select 1 from foo where .....' will not read heap
tuples (if index isn't loosy, of course) ?

On Mon, 28 Mar 2005, Tom Lane wrote:

> Log Message:
> -----------
> First steps towards index scans with heap access decoupled from index
> access: define new index access method functions 'amgetmulti' that can
> fetch multiple TIDs per call. (The functions exist but are totally
> untested as yet.) Since I was modifying pg_am anyway, remove the
> no-longer-needed 'rel' parameter from amcostestimate functions, and
> also remove the vestigial amowner column that was creating useless
> work for Alvaro's shared-object-dependencies project.
> Initdb forced due to changes in pg_am.
>
> Modified Files:
> --------------
> pgsql/doc/src/sgml:
> catalogs.sgml (r2.96 -> r2.97)
> (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/catalogs.sgml.diff?r1=2.96&r2=2.97)
> indexam.sgml (r2.2 -> r2.3)
> (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/indexam.sgml.diff?r1=2.2&r2=2.3)
> pgsql/src/backend/access/gist:
> gistget.c (r1.44 -> r1.45)
> (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/gist/gistget.c.diff?r1=1.44&r2=1.45)
> pgsql/src/backend/access/hash:
> hash.c (r1.77 -> r1.78)
> (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/hash/hash.c.diff?r1=1.77&r2=1.78)
> pgsql/src/backend/access/heap:
> heapam.c (r1.184 -> r1.185)
> (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/heap/heapam.c.diff?r1=1.184&r2=1.185)
> pgsql/src/backend/access/index:
> genam.c (r1.44 -> r1.45)
> (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/index/genam.c.diff?r1=1.44&r2=1.45)
> indexam.c (r1.78 -> r1.79)
> (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/index/indexam.c.diff?r1=1.78&r2=1.79)
> pgsql/src/backend/access/nbtree:
> nbtree.c (r1.126 -> r1.127)
> (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/nbtree/nbtree.c.diff?r1=1.126&r2=1.127)
> pgsql/src/backend/access/rtree:
> rtget.c (r1.34 -> r1.35)
> (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/rtree/rtget.c.diff?r1=1.34&r2=1.35)
> pgsql/src/backend/optimizer/path:
> costsize.c (r1.139 -> r1.140)
> (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/path/costsize.c.diff?r1=1.139&r2=1.140)
> pgsql/src/backend/utils/adt:
> selfuncs.c (r1.174 -> r1.175)
> (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/selfuncs.c.diff?r1=1.174&r2=1.175)
> pgsql/src/include/access:
> genam.h (r1.48 -> r1.49)
> (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/access/genam.h.diff?r1=1.48&r2=1.49)
> gist.h (r1.43 -> r1.44)
> (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/access/gist.h.diff?r1=1.43&r2=1.44)
> hash.h (r1.60 -> r1.61)
> (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/access/hash.h.diff?r1=1.60&r2=1.61)
> nbtree.h (r1.84 -> r1.85)
> (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/access/nbtree.h.diff?r1=1.84&r2=1.85)
> relscan.h (r1.37 -> r1.38)
> (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/access/relscan.h.diff?r1=1.37&r2=1.38)
> rtree.h (r1.37 -> r1.38)
> (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/access/rtree.h.diff?r1=1.37&r2=1.38)
> pgsql/src/include/catalog:
> catversion.h (r1.259 -> r1.260)
> (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/catversion.h.diff?r1=1.259&r2=1.260)
> pg_am.h (r1.31 -> r1.32)
> (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_am.h.diff?r1=1.31&r2=1.32)
> pg_proc.h (r1.353 -> r1.354)
> (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_proc.h.diff?r1=1.353&r2=1.354)
>
> ---------------------------(end of broadcast)---------------------------
> TIP 4: Don't 'kill -9' the postmaster
>

Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
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