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<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:#595959'>Hey everybody,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:#595959'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:#595959'>Sorry for disturbing you but I’m a little bit lost in one
simple and probably easy to solve issue but I can’t see it anymore. What
is wrong with this request? Why is the inner-query treated as unknown instead
of text? Thank you!<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:#595959'><o:p> </o:p></span></p>
<p class=MsoPlainText><span lang=EN-US>postgres=# SELECT * FROM
shortest_path('SELECT gid as id, source::integer, target::integer,
length::double precision as cost FROM ways',10, 20, false, false);<o:p></o:p></span></p>
<p class=MsoPlainText><span lang=EN-US>ERROR: function
shortest_path(unknown, integer, integer, boolean, boolean) does not exist<o:p></o:p></span></p>
<p class=MsoPlainText><span lang=EN-US>LINE 1: SELECT * FROM
shortest_path('SELECT gid as id, source::integ...<o:p></o:p></span></p>
<p class=MsoPlainText><span lang=EN-US>HINT: No function matches the
given name and argument types. You might need to add explicit type casts.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>The function does exist because I executed:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>CREATE OR REPLACE FUNCTION
shortest_path(sql text, source_id integer, target_id integer, directed boolean,
has_reverse_cost boolean)<br>
RETURNS SETOF path_result AS<br>
'/usr/lib/postgresql/8.4/lib/librouting', 'shortest_path'<br>
LANGUAGE 'c' IMMUTABLE STRICT<br>
COST 1<br>
ROWS 1000;<br>
ALTER FUNCTION shortest_path(text, integer, integer, boolean, boolean) OWNER TO
postgres;<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:#595959'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:#595959'>Regards<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:#595959'>Frank<o:p></o:p></span></p>
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