HiveSQL IF ELSE STATMENT Conditions Migration From GreenPlum - hive

Question

We have to migrate similar IF ELSE statement from Greenplum to HiveSQL, please help us below statement.
SELECT (date_trunc('month', Z_ops_date::date) - interval '1 month')::date into v_lmtd_FrDate;
SELECT DATE_PART('days' , DATE_TRUNC('month', Z_ops_date::date) - '0 MONTH'::INTERVAL - '1 DAY'::INTERVAL ) INTO v_lmtd_endday;
SELECT DATE_PART('days', Z_ops_date::date + 1) INTO v_cur_day;
if v_cur_day = 1 then
SELECT (DATE_TRUNC('month', Z_ops_date::date) - '0 MONTH'::INTERVAL - '1 DAY'::INTERVAL)::date INTO v_lmtd_ToDate ; -- last day of LMTD
else
if v_lmtd_endday > v_cur_day then
SELECT Z_ops_date::date - substring((select (date_trunc('month',Z_ops_date::date))::date - 1)::character varying,9,10)::integer INTO v_lmtd_ToDate ; -- current day of LMTD
elseif v_lmtd_endday < v_cur_day then
SELECT (DATE_TRUNC('month', Z_ops_date::date) - '0 MONTH'::INTERVAL - '1 DAY'::INTERVAL)::date INTO v_lmtd_ToDate ;-- last day of LMTD
else
SELECT Z_ops_date::date - substring((select (date_trunc('month',Z_ops_date::date))::date - 1)::character varying,9,10)::integer INTO v_lmtd_ToDate ; -- current day of LMTD
end if;
end if;
above that condition will be applied as below query.
SELECT Z_ops_date ,extract(year from Z_ops_date) as Year,extract(month from Z_ops_date) as Month ,service_ID,service_type ,sum(fee_amt_day) as fee_amt_day
,v_lmtd_FrDate , v_lmtd_ToDate
FROM test.sampletable
WHERE data_date BETWEEN v_lmtd_FrDate AND v_lmtd_ToDate
GROUP BY service_ID,service_type ;