Clojure JDBC Postgres streaming resultset

clj-jdbc-postgres.clj

(defn query-lazy ;; adapted from https://stackoverflow.com/a/39775018
  [[sql & params] & {:as opts}]
  (jdbc/with-db-transaction [tx (db/connection)]
    (jdbc/query tx
                (into [(jdbc/prepare-statement (:connection tx) sql {:fetch-size 100})] params)
                opts)))