I'm curious what the result of a reverse index does on a table with url
like data, so I did the following
create function fn_strrev(text) returns text as 'return reverse($_[0])'
language 'plperl' with (iscachable);
create index r_url_idx on url( fn_strrev(url));
vacuum analyze;
explain select * from url where url like fn_strrev('%beta12.html');
QUERY PLAN
---------------------------------------------------------
Seq Scan on url (cost=0.00..13281.70 rows=1 width=454)
Filter: ((url)::text ~~ 'lmth.21ateb%'::text)
Is it possible to get the planner to use an index scan ?
How?
the db is using locale 'C'
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Dave Cramer
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