Re: pgsql: First steps towards index scans with heap - Mailing list pgsql-committers

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)
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83