Greetings!
I need the following: create an index on multiple values for a single row. My
other solution consists of a lot of duplicated rows in seperate tables and
triggers and indexes, resulting in slower performance.
The following fails on 9.2, it says ERROR: index expression cannot return a
set.
drop table if exists test;
create table test (id serial, data text );
insert into test VALUES(DEFAULT, 'testdata');
drop function if exists testfct();
CREATE OR REPLACE FUNCTION testfct(text) RETURNS text[] AS $$
DECLARE
result text[];
BEGIN
result = array_fill(''::text, ARRAY[1]);
result[0] = $1 || '-one';
result[1] = $1 || '-two';
RETURN result;
END;
$$ LANGUAGE plpgsql;
create index test_idx on test (unnest(testfct(data)));
any suggestions?
TIA,
F
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