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--
-- This file is part of TALER
-- Copyright (C) 2014--2022 Taler Systems SA
--
-- TALER is free software; you can redistribute it and/or modify it under the
-- terms of the GNU General Public License as published by the Free Software
-- Foundation; either version 3, or (at your option) any later version.
--
-- TALER is distributed in the hope that it will be useful, but WITHOUT ANY
-- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
-- A PARTICULAR PURPOSE. See the GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License along with
-- TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
--
CREATE OR REPLACE FUNCTION exchange_do_recoup_by_reserve(
IN res_pub BYTEA
)
RETURNS TABLE
(
denom_sig BYTEA,
denominations_serial BIGINT,
coin_pub BYTEA,
coin_sig BYTEA,
coin_blind BYTEA,
amount_val BIGINT,
amount_frac INTEGER,
recoup_timestamp BIGINT
)
LANGUAGE plpgsql
AS $$
DECLARE
res_uuid BIGINT;
blind_ev BYTEA;
c_pub BYTEA;
BEGIN
SELECT reserve_uuid
INTO res_uuid
FROM exchange.reserves
WHERE reserves.reserve_pub = res_pub;
FOR blind_ev IN
SELECT h_blind_ev
FROM exchange.reserves_out_by_reserve
WHERE reserves_out_by_reserve.reserve_uuid = res_uuid
LOOP
SELECT robr.coin_pub
INTO c_pub
FROM exchange.recoup_by_reserve robr
WHERE robr.reserve_out_serial_id = (
SELECT reserves_out.reserve_out_serial_id
FROM exchange.reserves_out
WHERE reserves_out.h_blind_ev = blind_ev
);
RETURN QUERY
SELECT kc.denom_sig,
kc.denominations_serial,
rc.coin_pub,
rc.coin_sig,
rc.coin_blind,
rc.amount_val,
rc.amount_frac,
rc.recoup_timestamp
FROM (
SELECT *
FROM exchange.known_coins
WHERE known_coins.coin_pub = c_pub
) kc
JOIN (
SELECT *
FROM exchange.recoup
WHERE recoup.coin_pub = c_pub
) rc USING (coin_pub);
END LOOP;
END;
$$;
COMMENT ON FUNCTION exchange_do_recoup_by_reserve
IS 'Recoup by reserve as a function to make sure we hit only the needed partition and not all when joining as joins on distributed tables fetch ALL rows from the shards';
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