BUG #7591: Large query string has limit

The following bug has been logged on the website:

Bug reference:      7591
Logged by:          Pat King
Email address:      pking@nrcan.gc.ca
PostgreSQL version: 9.1.3
Operating system:   RedHat Linux 6.2
Description:        =


Hi :

I am dealing with the open source program called "Geonetwork". It is passing
the following  query to postgres/postgis :

SELECT "fid", asText("the_geom") FROM "public"."spatialindex" WHERE ("fid" =
=3D
'10') OR ("fid" =3D '100') OR ("fid" =3D '1000') OR ("fid" =3D '10001') OR =
("fid"
=3D '10005') ..........

Unfortunately, the query has > 50,000 OR clauses, and the query hangs.

I tried the query for < 50,000 OR clauses with success.

The spatialindex table is :

geonetwork=3D# \d spatialindex
          Table "public.spatialindex"
  Column  |          Type          | Modifiers
----------+------------------------+-----------
 fid      | integer                | not null
 id       | character varying(250) |
 the_geom | geometry               |
Indexes:
    "spatialindex_pkey" PRIMARY KEY, btree (fid)
    "spatialindexndx1" btree (id)
    "spatialindexndx2" gist (the_geom)
Check constraints:
    "enforce_dims_the_geom" CHECK (st_ndims(the_geom) =3D 2)
    "enforce_geotype_the_geom" CHECK (geometrytype(the_geom) =3D
'MULTIPOLYGON'::text OR the_geom IS NULL)
    "enforce_srid_the_geom" CHECK (st_srid(the_geom) =3D 4326)