PostgreSQL function to create index from parent table.

Hi guys,

I want to copy indexes to child table from parent table, something like this:

CREATE OR REPLACE FUNCTION CREATE_INDEX_FOR_CHILD()
RETURNS void AS
$$
DECLARE
formal_table text;
BEGIN
FOR formal_table IN
SELECT 'CREATE '
|| CASE
WHEN i.indisunique THEN 'UNIQUE '
ELSE ''
END
|| 'INDEX '
|| 'P1_m7_s_'
|| c2.relname
|| ' ON '
||
'P1_m7_s'
|| ' USING btree ( '
|| split_part(split_part(pg_catalog.pg_get_indexdef(i.indexrelid, 0, true), '(', 2), ')', 1)
|| ' ); '
FROM pg_catalog.pg_class c
JOIN pg_catalog.pg_index i
ON(c.oid = i.indrelid)
JOIN pg_catalog.pg_class c2
ON(i.indexrelid = c2.oid)
JOIN pg_namespace nr
ON(nr.oid = c.relnamespace)
WHERE c.relname = 'm7_s'
loop
EXECUTE formal_table;
END LOOP;
END
$$ LANGUAGE plpgsql;

When I execute this function "SELECT CREATE_INDEX_FOR_CHILD();", it fails with the below error.

INFO: Exception occurred : state : 42601 message : query has no destination for result data detail : hint : If you want to discard the results of a SELECT, use PERFORM instead. context : PL/pgSQL function inline_code_block line 90 at SQL statement
Query returned successfully with no result in 156 ms.

Can someone help me understand what is the problem with this code ? How to resolve it?

Thanks in advance,
Sekhar