Allow TTL to support nested functions

[avinzhang]

Allow support of nested function in TTL statement

Sample query
ALTER TABLE test.ttl_rollup_test MODIFY TTL -- after 2 days: keep only the latest best price for each site-product-combination local_date + INTERVAL 2 DAY GROUP BY site_id, product_id SET local_date = max(local_date), event_time = max(event_time), price = argMax(price, concat(cast(event_time AS varchar), cast((100_000_000_000 - price) AS varchar))), shop_id = argMax(shop_id, concat(cast(event_time AS varchar), cast((100_000_000_000 - price) AS varchar))), merchant_id = argMax(merchant_id, concat(cast(event_time AS varchar), cast((100_000_000_000 - price) AS varchar))), offer_key = argMax(offer_key, concat(cast(event_time AS varchar), cast((100_000_000_000 - price) AS varchar)));

Currently the above statement will throw an error
com.clickhouse.client.ClickHouseException: Code: 10. DB::Exception: Not found column concat(CAST(event_time, 'varchar'), CAST(minus(100000000000, price), 'varchar')) in block. There are only columns: local_date, offer_key, shop_id, price, site_id, product_id, merchant_id, event_time: While executing TTL. (NOT_FOUND_COLUMN_IN_BLOCK) (version 23.9.6.20 (official build))

This works when just doing a select like this
select argMax(price, concat(cast(event_time AS varchar), cast((100_000_000_000 - price) AS varchar)))