SELECT * FROM где таблица like 'i'?

CREATE OR REPLACE FUNCTION some_find(db character varying, tablename character varying, what character varying)
	RETURNS SETOF RECORD AS
$func$
DECLARE
	where_query text;
	temprow record;
BEGIN
	where_query := '';
	FOR temprow IN
		SELECT "column_name" FROM INFORMATION_SCHEMA.COLUMNS
		WHERE "table_catalog" = db
		AND "table_name" = tablename
	LOOP
		where_query := where_query || ' OR "' || temprow."column_name" || '" LIKE ''%' || what || '%''';
	END LOOP;

	RETURN QUERY EXECUTE 'SELECT * FROM "' || tablename || '" WHERE false' || where_query;
END
$func$  
LANGUAGE plpgsql;

SELECT * FROM some_find('somedb', 'sometable', 'sometext') AS t(field text); // Вот тут все равно придется указывать список полей.