[PostGIS] #5917: ST_Relate becomes unresponsive when the third parameter is too long

[PostGIS]

#5917: ST_Relate becomes unresponsive when the third parameter is too long
-----------------------+---------------------------
 Reporter:  dmyzl      |      Owner:  pramsey
     Type:  defect     |     Status:  new
 Priority:  medium     |  Milestone:  PostGIS 3.5.4
Component:  postgis    |    Version:  3.5.x
 Keywords:  ST_Relate  |
-----------------------+---------------------------
 The third parameter of `ST_Relate` should only be valid when it contains
 exactly 9 characters. However, if a much longer string is passed, the
 function becomes unresponsive for a long time. For example, the following
 SQL:

 {{{
 do $$
 declare
 s text;
 BEGIN
     s :='TTTTTTTTT';
     for i in 1..20 LOOP
         s :=  s || s;
     end LOOP;

     perform st_relate(
         st_geomfromtext('point(43 43)', 4326),
         st_geomfromtext('point(43 43)', 4326),
         s
     );
 END;
 $$ language plpgsql;
 }}}

 It might be better to validate the third parameter at the beginning of
 this function overload.

 postgis_full_version:

 {{{
 POSTGIS="3.5.3 0" [EXTENSION] PGSQL="170" GEOS="3.13.1-CAPI-1.19.2"
 SFCGAL="SFCGAL 1.5.0, CGAL 5.6, BOOST 1.74.0" PROJ="9.3.1
 NETWORK_ENABLED=OFF URL_ENDPOINT=https://cdn.proj.org
 USER_WRITABLE_DIRECTORY=/home/yzl/.local/share/proj
 DATABASE_PATH=/home/yzl/project/build_pg_postgis/proj-9.3.1/tmp_install/share/proj/proj.db"
 (compiled against PROJ 9.3.1) GDAL="GDAL 3.7.2, released 2023/09/05"
 LIBXML="2.9.13" LIBJSON="0.17" LIBPROTOBUF="1.3.3" WAGYU="0.5.0
 (Internal)" (core procs from "3.5.2 dea6d0a" need upgrade) TOPOLOGY
 (topology procs from "3.5.2 dea6d0a" need upgrade) RASTER (raster procs
 from "3.5.2 dea6d0a" need upgrade) (sfcgal procs from "3.5.2 dea6d0a" need
 upgrade)
 }}}
-- 
Ticket URL: <https://trac.osgeo.org/postgis/ticket/5917>
PostGIS <http://trac.osgeo.org/postgis/>
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